Finding the Third Proportional to 1,243,415 and 1,977,221

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243,415 : 1,977,221 = 1,977,221 : x
2. Step 2: Convert to fraction form
   1,243,415/1,977,221 = 1,977,221/x
3. Step 3: Cross multiply
   1,243,415x = 1,977,221 × 1,977,221
4. Step 4: Simplify right side
   1,243,415x = 3,909,402,882,841
5. Step 5: Solve for x
   x = 3,909,402,882,841/1,243,415
6. Step 6: Final answer
   x = 3,144,085.35