Finding the Fourth Proportional to 1,400.78, 1,932.38 and 841.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.78 : 1,932.38 = 841.28 : x
2. Step 2: Convert to fraction form
   1,400.78/1,932.38 = 841.28/x
3. Step 3: Cross multiply
   1,400.78x = 1,932.38 × 841.28
4. Step 4: Simplify right side
   1,400.78x = 1,625,672.65
5. Step 5: Solve for x
   x = 1,625,672.65/1,400.78
6. Step 6: Final answer
   x = 1,160.55