Finding the Fourth Proportional to 1,811.43, 2,499.78 and 1,065.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.43 : 2,499.78 = 1,065.42 : x
2. Step 2: Convert to fraction form
   1,811.43/2,499.78 = 1,065.42/x
3. Step 3: Cross multiply
   1,811.43x = 2,499.78 × 1,065.42
4. Step 4: Simplify right side
   1,811.43x = 2,663,315.61
5. Step 5: Solve for x
   x = 2,663,315.61/1,811.43
6. Step 6: Final answer
   x = 1,470.28