Finding the Fourth Proportional to 8,915.37, 13,374.72 and 3,985.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,915.37 : 13,374.72 = 3,985.20 : x
2. Step 2: Convert to fraction form
   8,915.37/13,374.72 = 3,985.20/x
3. Step 3: Cross multiply
   8,915.37x = 13,374.72 × 3,985.20
4. Step 4: Simplify right side
   8,915.37x = 53,300,934.14
5. Step 5: Solve for x
   x = 53,300,934.14/8,915.37
6. Step 6: Final answer
   x = 5,978.55