Finding the Fourth Proportional to 6,305.50, 8,687.10 and 4,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,305.50 : 8,687.10 = 4,978.72 : x
2. Step 2: Convert to fraction form
   6,305.50/8,687.10 = 4,978.72/x
3. Step 3: Cross multiply
   6,305.50x = 8,687.10 × 4,978.72
4. Step 4: Simplify right side
   6,305.50x = 43,250,638.51
5. Step 5: Solve for x
   x = 43,250,638.51/6,305.50
6. Step 6: Final answer
   x = 6,859.19