Finding the Fourth Proportional to 231,743.30, 347,874.15 and 216,515.30

Step by Step Solution

1. Step 1: Write the proportion equation
   231,743.30 : 347,874.15 = 216,515.30 : x
2. Step 2: Convert to fraction form
   231,743.30/347,874.15 = 216,515.30/x
3. Step 3: Cross multiply
   231,743.30x = 347,874.15 × 216,515.30
4. Step 4: Simplify right side
   231,743.30x = 75,320,075,949.50
5. Step 5: Solve for x
   x = 75,320,075,949.50/231,743.30
6. Step 6: Final answer
   x = 325,015.12