Finding the Fourth Proportional to 1,012.88, 1,517.78 and 602.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.88 : 1,517.78 = 602.22 : x
2. Step 2: Convert to fraction form
   1,012.88/1,517.78 = 602.22/x
3. Step 3: Cross multiply
   1,012.88x = 1,517.78 × 602.22
4. Step 4: Simplify right side
   1,012.88x = 914,037.47
5. Step 5: Solve for x
   x = 914,037.47/1,012.88
6. Step 6: Final answer
   x = 902.41