Finding the Fourth Proportional to 129,548.52, 178,776.18 and 72,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   129,548.52 : 178,776.18 = 72,978.12 : x
2. Step 2: Convert to fraction form
   129,548.52/178,776.18 = 72,978.12/x
3. Step 3: Cross multiply
   129,548.52x = 178,776.18 × 72,978.12
4. Step 4: Simplify right side
   129,548.52x = 13,046,749,517.18
5. Step 5: Solve for x
   x = 13,046,749,517.18/129,548.52
6. Step 6: Final answer
   x = 100,709.37