Finding the Fourth Proportional to 1,248.78, 1,870.73 and 760.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.78 : 1,870.73 = 760.62 : x
2. Step 2: Convert to fraction form
   1,248.78/1,870.73 = 760.62/x
3. Step 3: Cross multiply
   1,248.78x = 1,870.73 × 760.62
4. Step 4: Simplify right side
   1,248.78x = 1,422,905.30
5. Step 5: Solve for x
   x = 1,422,905.30/1,248.78
6. Step 6: Final answer
   x = 1,139.44