Finding the Fourth Proportional to 2,870.73, 4,305.20 and 922.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.73 : 4,305.20 = 922.50 : x
2. Step 2: Convert to fraction form
   2,870.73/4,305.20 = 922.50/x
3. Step 3: Cross multiply
   2,870.73x = 4,305.20 × 922.50
4. Step 4: Simplify right side
   2,870.73x = 3,971,542.39
5. Step 5: Solve for x
   x = 3,971,542.39/2,870.73
6. Step 6: Final answer
   x = 1,383.46