Finding the Fourth Proportional to 6,499.78, 8,969.69 and 3,515.61

Step by Step Solution

1. Step 1: Write the proportion equation
   6,499.78 : 8,969.69 = 3,515.61 : x
2. Step 2: Convert to fraction form
   6,499.78/8,969.69 = 3,515.61/x
3. Step 3: Cross multiply
   6,499.78x = 8,969.69 × 3,515.61
4. Step 4: Simplify right side
   6,499.78x = 31,533,931.86
5. Step 5: Solve for x
   x = 31,533,931.86/6,499.78
6. Step 6: Final answer
   x = 4,851.54