Finding the Fourth Proportional to 123,057.78, 169,819.72 and 66,469.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123,057.78 : 169,819.72 = 66,469.15 : x
2. Step 2: Convert to fraction form
   123,057.78/169,819.72 = 66,469.15/x
3. Step 3: Cross multiply
   123,057.78x = 169,819.72 × 66,469.15
4. Step 4: Simplify right side
   123,057.78x = 11,287,772,441.64
5. Step 5: Solve for x
   x = 11,287,772,441.64/123,057.78
6. Step 6: Final answer
   x = 91,727.42