Finding the Fourth Proportional to 8,515.31, 12,772.15 and 2,670.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,515.31 : 12,772.15 = 2,670.89 : x
2. Step 2: Convert to fraction form
   8,515.31/12,772.15 = 2,670.89/x
3. Step 3: Cross multiply
   8,515.31x = 12,772.15 × 2,670.89
4. Step 4: Simplify right side
   8,515.31x = 34,112,937.18
5. Step 5: Solve for x
   x = 34,112,937.18/8,515.31
6. Step 6: Final answer
   x = 4,006.07