Finding the Fourth Proportional to 8,598.40, 12,890.56 and 3,978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,598.40 : 12,890.56 = 3,978.24 : x
2. Step 2: Convert to fraction form
   8,598.40/12,890.56 = 3,978.24/x
3. Step 3: Cross multiply
   8,598.40x = 12,890.56 × 3,978.24
4. Step 4: Simplify right side
   8,598.40x = 51,281,741.41
5. Step 5: Solve for x
   x = 51,281,741.41/8,598.40
6. Step 6: Final answer
   x = 5,964.10