Finding the Fourth Proportional to 22,348.71, 30,842.55 and 12,920.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,348.71 : 30,842.55 = 12,920.31 : x
2. Step 2: Convert to fraction form
   22,348.71/30,842.55 = 12,920.31/x
3. Step 3: Cross multiply
   22,348.71x = 30,842.55 × 12,920.31
4. Step 4: Simplify right side
   22,348.71x = 398,495,307.19
5. Step 5: Solve for x
   x = 398,495,307.19/22,348.71
6. Step 6: Final answer
   x = 17,830.80