Finding the Fourth Proportional to 2,870.07, 4,304.43 and 921.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.07 : 4,304.43 = 921.75 : x
2. Step 2: Convert to fraction form
   2,870.07/4,304.43 = 921.75/x
3. Step 3: Cross multiply
   2,870.07x = 4,304.43 × 921.75
4. Step 4: Simplify right side
   2,870.07x = 3,967,608.35
5. Step 5: Solve for x
   x = 3,967,608.35/2,870.07
6. Step 6: Final answer
   x = 1,382.41