Finding the Fourth Proportional to 2,715.90, 4,071.53 and 2,586.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.90 : 4,071.53 = 2,586.72 : x
2. Step 2: Convert to fraction form
   2,715.90/4,071.53 = 2,586.72/x
3. Step 3: Cross multiply
   2,715.90x = 4,071.53 × 2,586.72
4. Step 4: Simplify right side
   2,715.90x = 10,531,895.15
5. Step 5: Solve for x
   x = 10,531,895.15/2,715.90
6. Step 6: Final answer
   x = 3,877.87