Finding the Fourth Proportional to 1,017.76, 1,404.05 and 781.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.76 : 1,404.05 = 781.29 : x
2. Step 2: Convert to fraction form
   1,017.76/1,404.05 = 781.29/x
3. Step 3: Cross multiply
   1,017.76x = 1,404.05 × 781.29
4. Step 4: Simplify right side
   1,017.76x = 1,096,972.18
5. Step 5: Solve for x
   x = 1,096,972.18/1,017.76
6. Step 6: Final answer
   x = 1,077.83