Finding the Fourth Proportional to 231,517.85, 349,012.06 and 216,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   231,517.85 : 349,012.06 = 216,086.72 : x
2. Step 2: Convert to fraction form
   231,517.85/349,012.06 = 216,086.72/x
3. Step 3: Cross multiply
   231,517.85x = 349,012.06 × 216,086.72
4. Step 4: Simplify right side
   231,517.85x = 75,416,870,205.41
5. Step 5: Solve for x
   x = 75,416,870,205.41/231,517.85
6. Step 6: Final answer
   x = 325,749.70