Finding the Fourth Proportional to 1,101.78, 1,642.79 and 1,008.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.78 : 1,642.79 = 1,008.49 : x
2. Step 2: Convert to fraction form
   1,101.78/1,642.79 = 1,008.49/x
3. Step 3: Cross multiply
   1,101.78x = 1,642.79 × 1,008.49
4. Step 4: Simplify right side
   1,101.78x = 1,656,729.07
5. Step 5: Solve for x
   x = 1,656,729.07/1,101.78
6. Step 6: Final answer
   x = 1,503.69