Finding the Fourth Proportional to 1,811.70, 2,499.12 and 1,065.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.70 : 2,499.12 = 1,065.42 : x
2. Step 2: Convert to fraction form
   1,811.70/2,499.12 = 1,065.42/x
3. Step 3: Cross multiply
   1,811.70x = 2,499.12 × 1,065.42
4. Step 4: Simplify right side
   1,811.70x = 2,662,612.43
5. Step 5: Solve for x
   x = 2,662,612.43/1,811.70
6. Step 6: Final answer
   x = 1,469.68