Finding the Fourth Proportional to 6,339.78, 8,748.74 and 3,507.31

Step by Step Solution

1. Step 1: Write the proportion equation
   6,339.78 : 8,748.74 = 3,507.31 : x
2. Step 2: Convert to fraction form
   6,339.78/8,748.74 = 3,507.31/x
3. Step 3: Cross multiply
   6,339.78x = 8,748.74 × 3,507.31
4. Step 4: Simplify right side
   6,339.78x = 30,684,514.82
5. Step 5: Solve for x
   x = 30,684,514.82/6,339.78
6. Step 6: Final answer
   x = 4,840.00