Finding the Fourth Proportional to 1,100.67, 1,648.17 and 840.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.67 : 1,648.17 = 840.93 : x
2. Step 2: Convert to fraction form
   1,100.67/1,648.17 = 840.93/x
3. Step 3: Cross multiply
   1,100.67x = 1,648.17 × 840.93
4. Step 4: Simplify right side
   1,100.67x = 1,385,995.60
5. Step 5: Solve for x
   x = 1,385,995.60/1,100.67
6. Step 6: Final answer
   x = 1,259.23