Finding the Fourth Proportional to 129,373.30, 178,530.50 and 72,010.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,373.30 : 178,530.50 = 72,010.72 : x
2. Step 2: Convert to fraction form
   129,373.30/178,530.50 = 72,010.72/x
3. Step 3: Cross multiply
   129,373.30x = 178,530.50 × 72,010.72
4. Step 4: Simplify right side
   129,373.30x = 12,856,109,846.96
5. Step 5: Solve for x
   x = 12,856,109,846.96/129,373.30
6. Step 6: Final answer
   x = 99,372.20