Finding the Fourth Proportional to 22,773.98, 31,428.88 and 13,213.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,773.98 : 31,428.88 = 13,213.15 : x
2. Step 2: Convert to fraction form
   22,773.98/31,428.88 = 13,213.15/x
3. Step 3: Cross multiply
   22,773.98x = 31,428.88 × 13,213.15
4. Step 4: Simplify right side
   22,773.98x = 415,274,394.17
5. Step 5: Solve for x
   x = 415,274,394.17/22,773.98
6. Step 6: Final answer
   x = 18,234.60