Finding the Fourth Proportional to 129,290.72, 178,217.88 and 118,443.20

Step by Step Solution

1. Step 1: Write the proportion equation
   129,290.72 : 178,217.88 = 118,443.20 : x
2. Step 2: Convert to fraction form
   129,290.72/178,217.88 = 118,443.20/x
3. Step 3: Cross multiply
   129,290.72x = 178,217.88 × 118,443.20
4. Step 4: Simplify right side
   129,290.72x = 21,108,696,004.42
5. Step 5: Solve for x
   x = 21,108,696,004.42/129,290.72
6. Step 6: Final answer
   x = 163,265.36