Finding the Third Proportional to 11,868.19 and 21,790.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,868.19 : 21,790.69 = 21,790.69 : x
2. Step 2: Convert to fraction form
   11,868.19/21,790.69 = 21,790.69/x
3. Step 3: Cross multiply
   11,868.19x = 21,790.69 × 21,790.69
4. Step 4: Simplify right side
   11,868.19x = 474,834,061.72
5. Step 5: Solve for x
   x = 474,834,061.72/11,868.19
6. Step 6: Final answer
   x = 40,008.98