Finding the Fourth Proportional to 2,869.47, 4,304.96 and 921.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,869.47 : 4,304.96 = 921.72 : x
2. Step 2: Convert to fraction form
   2,869.47/4,304.96 = 921.72/x
3. Step 3: Cross multiply
   2,869.47x = 4,304.96 × 921.72
4. Step 4: Simplify right side
   2,869.47x = 3,967,967.73
5. Step 5: Solve for x
   x = 3,967,967.73/2,869.47
6. Step 6: Final answer
   x = 1,382.82