Finding the Fourth Proportional to 1,402.80, 1,935.78 and 773.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.80 : 1,935.78 = 773.30 : x
2. Step 2: Convert to fraction form
   1,402.80/1,935.78 = 773.30/x
3. Step 3: Cross multiply
   1,402.80x = 1,935.78 × 773.30
4. Step 4: Simplify right side
   1,402.80x = 1,496,925.13
5. Step 5: Solve for x
   x = 1,496,925.13/1,402.80
6. Step 6: Final answer
   x = 1,067.10