Finding the Fourth Proportional to 2,870.01, 4,305.42 and 921.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.01 : 4,305.42 = 921.56 : x
2. Step 2: Convert to fraction form
   2,870.01/4,305.42 = 921.56/x
3. Step 3: Cross multiply
   2,870.01x = 4,305.42 × 921.56
4. Step 4: Simplify right side
   2,870.01x = 3,967,702.86
5. Step 5: Solve for x
   x = 3,967,702.86/2,870.01
6. Step 6: Final answer
   x = 1,382.47