Finding the Fourth Proportional to 1,100.15, 1,518.17 and 602.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.15 : 1,518.17 = 602.78 : x
2. Step 2: Convert to fraction form
   1,100.15/1,518.17 = 602.78/x
3. Step 3: Cross multiply
   1,100.15x = 1,518.17 × 602.78
4. Step 4: Simplify right side
   1,100.15x = 915,122.51
5. Step 5: Solve for x
   x = 915,122.51/1,100.15
6. Step 6: Final answer
   x = 831.82