Finding the Fourth Proportional to 22,721.86, 31,348.05 and 13,156.53

Step by Step Solution

1. Step 1: Write the proportion equation
   22,721.86 : 31,348.05 = 13,156.53 : x
2. Step 2: Convert to fraction form
   22,721.86/31,348.05 = 13,156.53/x
3. Step 3: Cross multiply
   22,721.86x = 31,348.05 × 13,156.53
4. Step 4: Simplify right side
   22,721.86x = 412,431,459.16
5. Step 5: Solve for x
   x = 412,431,459.16/22,721.86
6. Step 6: Final answer
   x = 18,151.31