Finding the Fourth Proportional to 1,360.99, 1,877.97 and 771.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.99 : 1,877.97 = 771.40 : x
2. Step 2: Convert to fraction form
   1,360.99/1,877.97 = 771.40/x
3. Step 3: Cross multiply
   1,360.99x = 1,877.97 × 771.40
4. Step 4: Simplify right side
   1,360.99x = 1,448,666.06
5. Step 5: Solve for x
   x = 1,448,666.06/1,360.99
6. Step 6: Final answer
   x = 1,064.42