Finding the Fourth Proportional to 22,918.72, 31,626.24 and 13,485.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,918.72 : 31,626.24 = 13,485.28 : x
2. Step 2: Convert to fraction form
   22,918.72/31,626.24 = 13,485.28/x
3. Step 3: Cross multiply
   22,918.72x = 31,626.24 × 13,485.28
4. Step 4: Simplify right side
   22,918.72x = 426,488,701.75
5. Step 5: Solve for x
   x = 426,488,701.75/22,918.72
6. Step 6: Final answer
   x = 18,608.75