Finding the Fourth Proportional to 8,488.83, 12,740.28 and 4,331.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,488.83 : 12,740.28 = 4,331.91 : x
2. Step 2: Convert to fraction form
   8,488.83/12,740.28 = 4,331.91/x
3. Step 3: Cross multiply
   8,488.83x = 12,740.28 × 4,331.91
4. Step 4: Simplify right side
   8,488.83x = 55,189,746.33
5. Step 5: Solve for x
   x = 55,189,746.33/8,488.83
6. Step 6: Final answer
   x = 6,501.46