Finding the Fourth Proportional to 1,851.72, 2,555.39 and 1,065.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.72 : 2,555.39 = 1,065.78 : x
2. Step 2: Convert to fraction form
   1,851.72/2,555.39 = 1,065.78/x
3. Step 3: Cross multiply
   1,851.72x = 2,555.39 × 1,065.78
4. Step 4: Simplify right side
   1,851.72x = 2,723,483.55
5. Step 5: Solve for x
   x = 2,723,483.55/1,851.72
6. Step 6: Final answer
   x = 1,470.79