Finding the Fourth Proportional to 1,048.78, 1,448.37 and 864.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.78 : 1,448.37 = 864.10 : x
2. Step 2: Convert to fraction form
   1,048.78/1,448.37 = 864.10/x
3. Step 3: Cross multiply
   1,048.78x = 1,448.37 × 864.10
4. Step 4: Simplify right side
   1,048.78x = 1,251,524.95
5. Step 5: Solve for x
   x = 1,251,524.95/1,048.78
6. Step 6: Final answer
   x = 1,193.32