Finding the Fourth Proportional to 1,248.18, 1,870.38 and 728.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.18 : 1,870.38 = 728.34 : x
2. Step 2: Convert to fraction form
   1,248.18/1,870.38 = 728.34/x
3. Step 3: Cross multiply
   1,248.18x = 1,870.38 × 728.34
4. Step 4: Simplify right side
   1,248.18x = 1,362,272.57
5. Step 5: Solve for x
   x = 1,362,272.57/1,248.18
6. Step 6: Final answer
   x = 1,091.41