Finding the Fourth Proportional to 129,401.56, 178,570.67 and 72,040.88

Step by Step Solution

1. Step 1: Write the proportion equation
   129,401.56 : 178,570.67 = 72,040.88 : x
2. Step 2: Convert to fraction form
   129,401.56/178,570.67 = 72,040.88/x
3. Step 3: Cross multiply
   129,401.56x = 178,570.67 × 72,040.88
4. Step 4: Simplify right side
   129,401.56x = 12,864,388,835.52
5. Step 5: Solve for x
   x = 12,864,388,835.52/129,401.56
6. Step 6: Final answer
   x = 99,414.48