Finding the Third Proportional to 2,155,188,642.19 and 4,646,779,435.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155,188,642.19 : 4,646,779,435.69 = 4,646,779,435.69 : x
2. Step 2: Convert to fraction form
   2,155,188,642.19/4,646,779,435.69 = 4,646,779,435.69/x
3. Step 3: Cross multiply
   2,155,188,642.19x = 4,646,779,435.69 × 4,646,779,435.69
4. Step 4: Simplify right side
   2,155,188,642.19x = 21,592,559,123,928,240,128
5. Step 5: Solve for x
   x = 21,592,559,123,928,240,128/2,155,188,642.19
6. Step 6: Final answer
   x = 10,018,871,991.65