Finding the Fourth Proportional to 1,248.12, 1,871.69 and 554.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.12 : 1,871.69 = 554.31 : x
2. Step 2: Convert to fraction form
   1,248.12/1,871.69 = 554.31/x
3. Step 3: Cross multiply
   1,248.12x = 1,871.69 × 554.31
4. Step 4: Simplify right side
   1,248.12x = 1,037,493.71
5. Step 5: Solve for x
   x = 1,037,493.71/1,248.12
6. Step 6: Final answer
   x = 831.25