Finding the Fourth Proportional to 129,030.32, 178,065 and 72,440.24

Step by Step Solution

1. Step 1: Write the proportion equation
   129,030.32 : 178,065 = 72,440.24 : x
2. Step 2: Convert to fraction form
   129,030.32/178,065 = 72,440.24/x
3. Step 3: Cross multiply
   129,030.32x = 178,065 × 72,440.24
4. Step 4: Simplify right side
   129,030.32x = 12,899,071,335.60
5. Step 5: Solve for x
   x = 12,899,071,335.60/129,030.32
6. Step 6: Final answer
   x = 99,969.30