Finding the Fourth Proportional to 3,665.83, 5,058.51 and 2,153.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.83 : 5,058.51 = 2,153.15 : x
2. Step 2: Convert to fraction form
   3,665.83/5,058.51 = 2,153.15/x
3. Step 3: Cross multiply
   3,665.83x = 5,058.51 × 2,153.15
4. Step 4: Simplify right side
   3,665.83x = 10,891,730.81
5. Step 5: Solve for x
   x = 10,891,730.81/3,665.83
6. Step 6: Final answer
   x = 2,971.15