Finding the Fourth Proportional to 8,492.31, 12,721.88 and 5,561.73

Step by Step Solution

1. Step 1: Write the proportion equation
   8,492.31 : 12,721.88 = 5,561.73 : x
2. Step 2: Convert to fraction form
   8,492.31/12,721.88 = 5,561.73/x
3. Step 3: Cross multiply
   8,492.31x = 12,721.88 × 5,561.73
4. Step 4: Simplify right side
   8,492.31x = 70,755,675.56
5. Step 5: Solve for x
   x = 70,755,675.56/8,492.31
6. Step 6: Final answer
   x = 8,331.73