Finding the Fourth Proportional to 1,139.02, 1,706.86 and 618.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.02 : 1,706.86 = 618.58 : x
2. Step 2: Convert to fraction form
   1,139.02/1,706.86 = 618.58/x
3. Step 3: Cross multiply
   1,139.02x = 1,706.86 × 618.58
4. Step 4: Simplify right side
   1,139.02x = 1,055,829.46
5. Step 5: Solve for x
   x = 1,055,829.46/1,139.02
6. Step 6: Final answer
   x = 926.96