Finding the Fourth Proportional to 1,665.12, 2,499.30 and 1,282.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.12 : 2,499.30 = 1,282.80 : x
2. Step 2: Convert to fraction form
   1,665.12/2,499.30 = 1,282.80/x
3. Step 3: Cross multiply
   1,665.12x = 2,499.30 × 1,282.80
4. Step 4: Simplify right side
   1,665.12x = 3,206,102.04
5. Step 5: Solve for x
   x = 3,206,102.04/1,665.12
6. Step 6: Final answer
   x = 1,925.45