Finding the Fourth Proportional to 1,284.81, 1,773.05 and 780.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.81 : 1,773.05 = 780.52 : x
2. Step 2: Convert to fraction form
   1,284.81/1,773.05 = 780.52/x
3. Step 3: Cross multiply
   1,284.81x = 1,773.05 × 780.52
4. Step 4: Simplify right side
   1,284.81x = 1,383,898.50
5. Step 5: Solve for x
   x = 1,383,898.50/1,284.81
6. Step 6: Final answer
   x = 1,077.12