Finding the Fourth Proportional to 8,488.71, 12,730.91 and 2,642.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,488.71 : 12,730.91 = 2,642.31 : x
2. Step 2: Convert to fraction form
   8,488.71/12,730.91 = 2,642.31/x
3. Step 3: Cross multiply
   8,488.71x = 12,730.91 × 2,642.31
4. Step 4: Simplify right side
   8,488.71x = 33,638,997.59
5. Step 5: Solve for x
   x = 33,638,997.59/8,488.71
6. Step 6: Final answer
   x = 3,962.79