Finding the Fourth Proportional to 99,420.56, 137,287.88 and 67,665.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,420.56 : 137,287.88 = 67,665.32 : x
2. Step 2: Convert to fraction form
   99,420.56/137,287.88 = 67,665.32/x
3. Step 3: Cross multiply
   99,420.56x = 137,287.88 × 67,665.32
4. Step 4: Simplify right side
   99,420.56x = 9,289,628,332.32
5. Step 5: Solve for x
   x = 9,289,628,332.32/99,420.56
6. Step 6: Final answer
   x = 93,437.70