Finding the Fourth Proportional to 2,016.77, 3,025.35 and 921.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.77 : 3,025.35 = 921.65 : x
2. Step 2: Convert to fraction form
   2,016.77/3,025.35 = 921.65/x
3. Step 3: Cross multiply
   2,016.77x = 3,025.35 × 921.65
4. Step 4: Simplify right side
   2,016.77x = 2,788,298.70
5. Step 5: Solve for x
   x = 2,788,298.70/2,016.77
6. Step 6: Final answer
   x = 1,382.56