Finding the Fourth Proportional to 22,870.61, 31,557.63 and 13,440.99

Step by Step Solution

1. Step 1: Write the proportion equation
   22,870.61 : 31,557.63 = 13,440.99 : x
2. Step 2: Convert to fraction form
   22,870.61/31,557.63 = 13,440.99/x
3. Step 3: Cross multiply
   22,870.61x = 31,557.63 × 13,440.99
4. Step 4: Simplify right side
   22,870.61x = 424,165,789.25
5. Step 5: Solve for x
   x = 424,165,789.25/22,870.61
6. Step 6: Final answer
   x = 18,546.33