Finding the Fourth Proportional to 1,400.61, 1,932.81 and 771.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.61 : 1,932.81 = 771.15 : x
2. Step 2: Convert to fraction form
   1,400.61/1,932.81 = 771.15/x
3. Step 3: Cross multiply
   1,400.61x = 1,932.81 × 771.15
4. Step 4: Simplify right side
   1,400.61x = 1,490,486.43
5. Step 5: Solve for x
   x = 1,490,486.43/1,400.61
6. Step 6: Final answer
   x = 1,064.17