Finding the Fourth Proportional to 129,048.16, 178,086.72 and 72,459.76

Step by Step Solution

1. Step 1: Write the proportion equation
   129,048.16 : 178,086.72 = 72,459.76 : x
2. Step 2: Convert to fraction form
   129,048.16/178,086.72 = 72,459.76/x
3. Step 3: Cross multiply
   129,048.16x = 178,086.72 × 72,459.76
4. Step 4: Simplify right side
   129,048.16x = 12,904,120,990.39
5. Step 5: Solve for x
   x = 12,904,120,990.39/129,048.16
6. Step 6: Final answer
   x = 99,994.61