Finding the Fourth Proportional to 6,515.52, 8,990.72 and 3,720.96

Step by Step Solution

1. Step 1: Write the proportion equation
   6,515.52 : 8,990.72 = 3,720.96 : x
2. Step 2: Convert to fraction form
   6,515.52/8,990.72 = 3,720.96/x
3. Step 3: Cross multiply
   6,515.52x = 8,990.72 × 3,720.96
4. Step 4: Simplify right side
   6,515.52x = 33,454,109.49
5. Step 5: Solve for x
   x = 33,454,109.49/6,515.52
6. Step 6: Final answer
   x = 5,134.53