Finding the Fourth Proportional to 1,085.68, 1,496.28 and 790.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.68 : 1,496.28 = 790.48 : x
2. Step 2: Convert to fraction form
   1,085.68/1,496.28 = 790.48/x
3. Step 3: Cross multiply
   1,085.68x = 1,496.28 × 790.48
4. Step 4: Simplify right side
   1,085.68x = 1,182,779.41
5. Step 5: Solve for x
   x = 1,182,779.41/1,085.68
6. Step 6: Final answer
   x = 1,089.44