Finding the Fourth Proportional to 2,076.30, 3,117.15 and 1,665.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.30 : 3,117.15 = 1,665.90 : x
2. Step 2: Convert to fraction form
   2,076.30/3,117.15 = 1,665.90/x
3. Step 3: Cross multiply
   2,076.30x = 3,117.15 × 1,665.90
4. Step 4: Simplify right side
   2,076.30x = 5,192,860.19
5. Step 5: Solve for x
   x = 5,192,860.19/2,076.30
6. Step 6: Final answer
   x = 2,501.02