Finding the Fourth Proportional to 6,899.94, 9,521.63 and 3,915.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,899.94 : 9,521.63 = 3,915.72 : x
2. Step 2: Convert to fraction form
   6,899.94/9,521.63 = 3,915.72/x
3. Step 3: Cross multiply
   6,899.94x = 9,521.63 × 3,915.72
4. Step 4: Simplify right side
   6,899.94x = 37,284,017.45
5. Step 5: Solve for x
   x = 37,284,017.45/6,899.94
6. Step 6: Final answer
   x = 5,403.53