Finding the Fourth Proportional to 89,380.72, 133,866.84 and 42,666.40

Step by Step Solution

1. Step 1: Write the proportion equation
   89,380.72 : 133,866.84 = 42,666.40 : x
2. Step 2: Convert to fraction form
   89,380.72/133,866.84 = 42,666.40/x
3. Step 3: Cross multiply
   89,380.72x = 133,866.84 × 42,666.40
4. Step 4: Simplify right side
   89,380.72x = 5,711,616,142.18
5. Step 5: Solve for x
   x = 5,711,616,142.18/89,380.72
6. Step 6: Final answer
   x = 63,902.10