Finding the Fourth Proportional to 6,440.47, 8,887.78 and 3,607.87

Step by Step Solution

1. Step 1: Write the proportion equation
   6,440.47 : 8,887.78 = 3,607.87 : x
2. Step 2: Convert to fraction form
   6,440.47/8,887.78 = 3,607.87/x
3. Step 3: Cross multiply
   6,440.47x = 8,887.78 × 3,607.87
4. Step 4: Simplify right side
   6,440.47x = 32,065,954.83
5. Step 5: Solve for x
   x = 32,065,954.83/6,440.47
6. Step 6: Final answer
   x = 4,978.82