Finding the Fourth Proportional to 1,811.60, 2,499.96 and 1,065.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.60 : 2,499.96 = 1,065.39 : x
2. Step 2: Convert to fraction form
   1,811.60/2,499.96 = 1,065.39/x
3. Step 3: Cross multiply
   1,811.60x = 2,499.96 × 1,065.39
4. Step 4: Simplify right side
   1,811.60x = 2,663,436.38
5. Step 5: Solve for x
   x = 2,663,436.38/1,811.60
6. Step 6: Final answer
   x = 1,470.21