Finding the Fourth Proportional to 23,116.31, 31,900.19 and 12,907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   23,116.31 : 31,900.19 = 12,907.50 : x
2. Step 2: Convert to fraction form
   23,116.31/31,900.19 = 12,907.50/x
3. Step 3: Cross multiply
   23,116.31x = 31,900.19 × 12,907.50
4. Step 4: Simplify right side
   23,116.31x = 411,751,702.43
5. Step 5: Solve for x
   x = 411,751,702.43/23,116.31
6. Step 6: Final answer
   x = 17,812.17