Finding the Fourth Proportional to 1,811.12, 2,499.76 and 1,065.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.12 : 2,499.76 = 1,065.12 : x
2. Step 2: Convert to fraction form
   1,811.12/2,499.76 = 1,065.12/x
3. Step 3: Cross multiply
   1,811.12x = 2,499.76 × 1,065.12
4. Step 4: Simplify right side
   1,811.12x = 2,662,544.37
5. Step 5: Solve for x
   x = 2,662,544.37/1,811.12
6. Step 6: Final answer
   x = 1,470.11