Finding the Fourth Proportional to 89,379.68, 133,865.32 and 42,665.36

Step by Step Solution

1. Step 1: Write the proportion equation
   89,379.68 : 133,865.32 = 42,665.36 : x
2. Step 2: Convert to fraction form
   89,379.68/133,865.32 = 42,665.36/x
3. Step 3: Cross multiply
   89,379.68x = 133,865.32 × 42,665.36
4. Step 4: Simplify right side
   89,379.68x = 5,711,412,069.32
5. Step 5: Solve for x
   x = 5,711,412,069.32/89,379.68
6. Step 6: Final answer
   x = 63,900.57