Finding the Fourth Proportional to 6,439.84, 8,887.12 and 3,607.42

Step by Step Solution

1. Step 1: Write the proportion equation
   6,439.84 : 8,887.12 = 3,607.42 : x
2. Step 2: Convert to fraction form
   6,439.84/8,887.12 = 3,607.42/x
3. Step 3: Cross multiply
   6,439.84x = 8,887.12 × 3,607.42
4. Step 4: Simplify right side
   6,439.84x = 32,059,559.86
5. Step 5: Solve for x
   x = 32,059,559.86/6,439.84
6. Step 6: Final answer
   x = 4,978.32