Finding the Fourth Proportional to 22,468.40, 31,012.56 and 13,040

Step by Step Solution

1. Step 1: Write the proportion equation
   22,468.40 : 31,012.56 = 13,040 : x
2. Step 2: Convert to fraction form
   22,468.40/31,012.56 = 13,040/x
3. Step 3: Cross multiply
   22,468.40x = 31,012.56 × 13,040
4. Step 4: Simplify right side
   22,468.40x = 404,403,782.40
5. Step 5: Solve for x
   x = 404,403,782.40/22,468.40
6. Step 6: Final answer
   x = 17,998.78