Finding the Fourth Proportional to 1,090.72, 1,505.78 and 841.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.72 : 1,505.78 = 841.48 : x
2. Step 2: Convert to fraction form
   1,090.72/1,505.78 = 841.48/x
3. Step 3: Cross multiply
   1,090.72x = 1,505.78 × 841.48
4. Step 4: Simplify right side
   1,090.72x = 1,267,083.75
5. Step 5: Solve for x
   x = 1,267,083.75/1,090.72
6. Step 6: Final answer
   x = 1,161.69