Finding the Fourth Proportional to 1,192.78, 1,649.55 and 1,045.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.78 : 1,649.55 = 1,045.18 : x
2. Step 2: Convert to fraction form
   1,192.78/1,649.55 = 1,045.18/x
3. Step 3: Cross multiply
   1,192.78x = 1,649.55 × 1,045.18
4. Step 4: Simplify right side
   1,192.78x = 1,724,076.67
5. Step 5: Solve for x
   x = 1,724,076.67/1,192.78
6. Step 6: Final answer
   x = 1,445.43