Finding the Third Proportional to 87,490.69 and 139,543.88

Step by Step Solution

1. Step 1: Write the proportion equation
   87,490.69 : 139,543.88 = 139,543.88 : x
2. Step 2: Convert to fraction form
   87,490.69/139,543.88 = 139,543.88/x
3. Step 3: Cross multiply
   87,490.69x = 139,543.88 × 139,543.88
4. Step 4: Simplify right side
   87,490.69x = 19,472,493,050.02
5. Step 5: Solve for x
   x = 19,472,493,050.02/87,490.69
6. Step 6: Final answer
   x = 222,566.47