Finding the Fourth Proportional to 9,915.09, 13,682.91 and 5,438.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.09 : 13,682.91 = 5,438.81 : x
2. Step 2: Convert to fraction form
   9,915.09/13,682.91 = 5,438.81/x
3. Step 3: Cross multiply
   9,915.09x = 13,682.91 × 5,438.81
4. Step 4: Simplify right side
   9,915.09x = 74,418,713.53
5. Step 5: Solve for x
   x = 74,418,713.53/9,915.09
6. Step 6: Final answer
   x = 7,505.60