Finding the Fourth Proportional to 6,900.12, 9,521.82 and 3,915.88

Step by Step Solution

1. Step 1: Write the proportion equation
   6,900.12 : 9,521.82 = 3,915.88 : x
2. Step 2: Convert to fraction form
   6,900.12/9,521.82 = 3,915.88/x
3. Step 3: Cross multiply
   6,900.12x = 9,521.82 × 3,915.88
4. Step 4: Simplify right side
   6,900.12x = 37,286,304.50
5. Step 5: Solve for x
   x = 37,286,304.50/6,900.12
6. Step 6: Final answer
   x = 5,403.72