Finding the Fourth Proportional to 2,165.72, 3,248.76 and 1,587.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.72 : 3,248.76 = 1,587.90 : x
2. Step 2: Convert to fraction form
   2,165.72/3,248.76 = 1,587.90/x
3. Step 3: Cross multiply
   2,165.72x = 3,248.76 × 1,587.90
4. Step 4: Simplify right side
   2,165.72x = 5,158,706.00
5. Step 5: Solve for x
   x = 5,158,706.00/2,165.72
6. Step 6: Final answer
   x = 2,381.99