Finding the Fourth Proportional to 22,911.60, 31,616.28 and 13,479.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,911.60 : 31,616.28 = 13,479.60 : x
2. Step 2: Convert to fraction form
   22,911.60/31,616.28 = 13,479.60/x
3. Step 3: Cross multiply
   22,911.60x = 31,616.28 × 13,479.60
4. Step 4: Simplify right side
   22,911.60x = 426,174,807.89
5. Step 5: Solve for x
   x = 426,174,807.89/22,911.60
6. Step 6: Final answer
   x = 18,600.83