Finding the Fourth Proportional to 129,575.50, 178,819.72 and 72,214.88

Step by Step Solution

1. Step 1: Write the proportion equation
   129,575.50 : 178,819.72 = 72,214.88 : x
2. Step 2: Convert to fraction form
   129,575.50/178,819.72 = 72,214.88/x
3. Step 3: Cross multiply
   129,575.50x = 178,819.72 × 72,214.88
4. Step 4: Simplify right side
   129,575.50x = 12,913,443,546.80
5. Step 5: Solve for x
   x = 12,913,443,546.80/129,575.50
6. Step 6: Final answer
   x = 99,659.61