Finding the Fourth Proportional to 2,771.61, 4,155.87 and 921.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,771.61 : 4,155.87 = 921.74 : x
2. Step 2: Convert to fraction form
   2,771.61/4,155.87 = 921.74/x
3. Step 3: Cross multiply
   2,771.61x = 4,155.87 × 921.74
4. Step 4: Simplify right side
   2,771.61x = 3,830,610.83
5. Step 5: Solve for x
   x = 3,830,610.83/2,771.61
6. Step 6: Final answer
   x = 1,382.09