Finding the Fourth Proportional to 3,665.89, 5,499.11 and 1,587.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.89 : 5,499.11 = 1,587.91 : x
2. Step 2: Convert to fraction form
   3,665.89/5,499.11 = 1,587.91/x
3. Step 3: Cross multiply
   3,665.89x = 5,499.11 × 1,587.91
4. Step 4: Simplify right side
   3,665.89x = 8,732,091.76
5. Step 5: Solve for x
   x = 8,732,091.76/3,665.89
6. Step 6: Final answer
   x = 2,381.98