Finding the Fourth Proportional to 1,401.98, 1,934.87 and 781.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.98 : 1,934.87 = 781.02 : x
2. Step 2: Convert to fraction form
   1,401.98/1,934.87 = 781.02/x
3. Step 3: Cross multiply
   1,401.98x = 1,934.87 × 781.02
4. Step 4: Simplify right side
   1,401.98x = 1,511,172.17
5. Step 5: Solve for x
   x = 1,511,172.17/1,401.98
6. Step 6: Final answer
   x = 1,077.88