Finding the Fourth Proportional to 89,379.72, 133,865.34 and 42,665.40

Step by Step Solution

1. Step 1: Write the proportion equation
   89,379.72 : 133,865.34 = 42,665.40 : x
2. Step 2: Convert to fraction form
   89,379.72/133,865.34 = 42,665.40/x
3. Step 3: Cross multiply
   89,379.72x = 133,865.34 × 42,665.40
4. Step 4: Simplify right side
   89,379.72x = 5,711,418,277.24
5. Step 5: Solve for x
   x = 5,711,418,277.24/89,379.72
6. Step 6: Final answer
   x = 63,900.61