Finding the Fourth Proportional to 6,499.91, 8,969.85 and 3,515.75

Step by Step Solution

1. Step 1: Write the proportion equation
   6,499.91 : 8,969.85 = 3,515.75 : x
2. Step 2: Convert to fraction form
   6,499.91/8,969.85 = 3,515.75/x
3. Step 3: Cross multiply
   6,499.91x = 8,969.85 × 3,515.75
4. Step 4: Simplify right side
   6,499.91x = 31,535,772.56
5. Step 5: Solve for x
   x = 31,535,772.56/6,499.91
6. Step 6: Final answer
   x = 4,851.72