Finding the Fourth Proportional to 6,899.73, 9,521.85 and 3,915.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,899.73 : 9,521.85 = 3,915.69 : x
2. Step 2: Convert to fraction form
   6,899.73/9,521.85 = 3,915.69/x
3. Step 3: Cross multiply
   6,899.73x = 9,521.85 × 3,915.69
4. Step 4: Simplify right side
   6,899.73x = 37,284,612.83
5. Step 5: Solve for x
   x = 37,284,612.83/6,899.73
6. Step 6: Final answer
   x = 5,403.78