Finding the Fourth Proportional to 1,360.80, 1,877.95 and 771.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.80 : 1,877.95 = 771.43 : x
2. Step 2: Convert to fraction form
   1,360.80/1,877.95 = 771.43/x
3. Step 3: Cross multiply
   1,360.80x = 1,877.95 × 771.43
4. Step 4: Simplify right side
   1,360.80x = 1,448,700.35
5. Step 5: Solve for x
   x = 1,448,700.35/1,360.80
6. Step 6: Final answer
   x = 1,064.59