Finding the Fourth Proportional to 6,259.94, 8,640.40 and 3,607.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,259.94 : 8,640.40 = 3,607.78 : x
2. Step 2: Convert to fraction form
   6,259.94/8,640.40 = 3,607.78/x
3. Step 3: Cross multiply
   6,259.94x = 8,640.40 × 3,607.78
4. Step 4: Simplify right side
   6,259.94x = 31,172,662.31
5. Step 5: Solve for x
   x = 31,172,662.31/6,259.94
6. Step 6: Final answer
   x = 4,979.71