Finding the Fourth Proportional to 1,629.50, 2,248.72 and 931.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,629.50 : 2,248.72 = 931.28 : x
2. Step 2: Convert to fraction form
   1,629.50/2,248.72 = 931.28/x
3. Step 3: Cross multiply
   1,629.50x = 2,248.72 × 931.28
4. Step 4: Simplify right side
   1,629.50x = 2,094,187.96
5. Step 5: Solve for x
   x = 2,094,187.96/1,629.50
6. Step 6: Final answer
   x = 1,285.17