Finding the Fourth Proportional to 3,665.76, 5,058.48 and 2,173.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.76 : 5,058.48 = 2,173.80 : x
2. Step 2: Convert to fraction form
   3,665.76/5,058.48 = 2,173.80/x
3. Step 3: Cross multiply
   3,665.76x = 5,058.48 × 2,173.80
4. Step 4: Simplify right side
   3,665.76x = 10,996,123.82
5. Step 5: Solve for x
   x = 10,996,123.82/3,665.76
6. Step 6: Final answer
   x = 2,999.68