Finding the Fourth Proportional to 2,870.16, 4,302.46 and 921.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.16 : 4,302.46 = 921.03 : x
2. Step 2: Convert to fraction form
   2,870.16/4,302.46 = 921.03/x
3. Step 3: Cross multiply
   2,870.16x = 4,302.46 × 921.03
4. Step 4: Simplify right side
   2,870.16x = 3,962,694.73
5. Step 5: Solve for x
   x = 3,962,694.73/2,870.16
6. Step 6: Final answer
   x = 1,380.65