Finding the Fourth Proportional to 10,522.76, 15,788.79 and 5,591.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,522.76 : 15,788.79 = 5,591.21 : x
2. Step 2: Convert to fraction form
   10,522.76/15,788.79 = 5,591.21/x
3. Step 3: Cross multiply
   10,522.76x = 15,788.79 × 5,591.21
4. Step 4: Simplify right side
   10,522.76x = 88,278,361.59
5. Step 5: Solve for x
   x = 88,278,361.59/10,522.76
6. Step 6: Final answer
   x = 8,389.28