Finding the Fourth Proportional to 129,592.42, 178,821.61 and 72,217.69

Step by Step Solution

1. Step 1: Write the proportion equation
   129,592.42 : 178,821.61 = 72,217.69 : x
2. Step 2: Convert to fraction form
   129,592.42/178,821.61 = 72,217.69/x
3. Step 3: Cross multiply
   129,592.42x = 178,821.61 × 72,217.69
4. Step 4: Simplify right side
   129,592.42x = 12,914,082,968.68
5. Step 5: Solve for x
   x = 12,914,082,968.68/129,592.42
6. Step 6: Final answer
   x = 99,651.53