Finding the Fourth Proportional to 6,899.28, 9,521.98 and 3,915.86

Step by Step Solution

1. Step 1: Write the proportion equation
   6,899.28 : 9,521.98 = 3,915.86 : x
2. Step 2: Convert to fraction form
   6,899.28/9,521.98 = 3,915.86/x
3. Step 3: Cross multiply
   6,899.28x = 9,521.98 × 3,915.86
4. Step 4: Simplify right side
   6,899.28x = 37,286,740.60
5. Step 5: Solve for x
   x = 37,286,740.60/6,899.28
6. Step 6: Final answer
   x = 5,404.44