Finding the Fourth Proportional to 129,084.16, 178,104.72 and 75,338.56

Step by Step Solution

1. Step 1: Write the proportion equation
   129,084.16 : 178,104.72 = 75,338.56 : x
2. Step 2: Convert to fraction form
   129,084.16/178,104.72 = 75,338.56/x
3. Step 3: Cross multiply
   129,084.16x = 178,104.72 × 75,338.56
4. Step 4: Simplify right side
   129,084.16x = 13,418,153,134.00
5. Step 5: Solve for x
   x = 13,418,153,134.00/129,084.16
6. Step 6: Final answer
   x = 103,948.87