Finding the Fourth Proportional to 1,401.15, 1,933.60 and 771.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.15 : 1,933.60 = 771.69 : x
2. Step 2: Convert to fraction form
   1,401.15/1,933.60 = 771.69/x
3. Step 3: Cross multiply
   1,401.15x = 1,933.60 × 771.69
4. Step 4: Simplify right side
   1,401.15x = 1,492,139.78
5. Step 5: Solve for x
   x = 1,492,139.78/1,401.15
6. Step 6: Final answer
   x = 1,064.94