Finding the Fourth Proportional to 2,565.50, 3,847.30 and 921.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.50 : 3,847.30 = 921.60 : x
2. Step 2: Convert to fraction form
   2,565.50/3,847.30 = 921.60/x
3. Step 3: Cross multiply
   2,565.50x = 3,847.30 × 921.60
4. Step 4: Simplify right side
   2,565.50x = 3,545,669.38
5. Step 5: Solve for x
   x = 3,545,669.38/2,565.50
6. Step 6: Final answer
   x = 1,382.06