Finding the Third Proportional to 59,085.28 and 129,649.78

Step by Step Solution

1. Step 1: Write the proportion equation
   59,085.28 : 129,649.78 = 129,649.78 : x
2. Step 2: Convert to fraction form
   59,085.28/129,649.78 = 129,649.78/x
3. Step 3: Cross multiply
   59,085.28x = 129,649.78 × 129,649.78
4. Step 4: Simplify right side
   59,085.28x = 16,809,065,778.17
5. Step 5: Solve for x
   x = 16,809,065,778.17/59,085.28
6. Step 6: Final answer
   x = 284,488.21