Finding the Fourth Proportional to 1,123.48, 1,547.80 and 791.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.48 : 1,547.80 = 791.32 : x
2. Step 2: Convert to fraction form
   1,123.48/1,547.80 = 791.32/x
3. Step 3: Cross multiply
   1,123.48x = 1,547.80 × 791.32
4. Step 4: Simplify right side
   1,123.48x = 1,224,805.10
5. Step 5: Solve for x
   x = 1,224,805.10/1,123.48
6. Step 6: Final answer
   x = 1,090.19