Finding the Fourth Proportional to 23,116.40, 31,904.52 and 13,690.16

Step by Step Solution

1. Step 1: Write the proportion equation
   23,116.40 : 31,904.52 = 13,690.16 : x
2. Step 2: Convert to fraction form
   23,116.40/31,904.52 = 13,690.16/x
3. Step 3: Cross multiply
   23,116.40x = 31,904.52 × 13,690.16
4. Step 4: Simplify right side
   23,116.40x = 436,777,983.52
5. Step 5: Solve for x
   x = 436,777,983.52/23,116.40
6. Step 6: Final answer
   x = 18,894.72