Finding the Fourth Proportional to 89,359.20, 133,820.10 and 42,557.40

Step by Step Solution

1. Step 1: Write the proportion equation
   89,359.20 : 133,820.10 = 42,557.40 : x
2. Step 2: Convert to fraction form
   89,359.20/133,820.10 = 42,557.40/x
3. Step 3: Cross multiply
   89,359.20x = 133,820.10 × 42,557.40
4. Step 4: Simplify right side
   89,359.20x = 5,695,035,523.74
5. Step 5: Solve for x
   x = 5,695,035,523.74/89,359.20
6. Step 6: Final answer
   x = 63,731.94