Finding the Fourth Proportional to 129,046.96, 178,080.20 and 72,460.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,046.96 : 178,080.20 = 72,460.72 : x
2. Step 2: Convert to fraction form
   129,046.96/178,080.20 = 72,460.72/x
3. Step 3: Cross multiply
   129,046.96x = 178,080.20 × 72,460.72
4. Step 4: Simplify right side
   129,046.96x = 12,903,819,509.74
5. Step 5: Solve for x
   x = 12,903,819,509.74/129,046.96
6. Step 6: Final answer
   x = 99,993.21