Finding the Fourth Proportional to 3,665.20, 5,058.01 and 2,173.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.20 : 5,058.01 = 2,173.86 : x
2. Step 2: Convert to fraction form
   3,665.20/5,058.01 = 2,173.86/x
3. Step 3: Cross multiply
   3,665.20x = 5,058.01 × 2,173.86
4. Step 4: Simplify right side
   3,665.20x = 10,995,405.62
5. Step 5: Solve for x
   x = 10,995,405.62/3,665.20
6. Step 6: Final answer
   x = 2,999.95