Finding the Fourth Proportional to 1,106.16, 1,658.40 and 618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.16 : 1,658.40 = 618.72 : x
2. Step 2: Convert to fraction form
   1,106.16/1,658.40 = 618.72/x
3. Step 3: Cross multiply
   1,106.16x = 1,658.40 × 618.72
4. Step 4: Simplify right side
   1,106.16x = 1,026,085.25
5. Step 5: Solve for x
   x = 1,026,085.25/1,106.16
6. Step 6: Final answer
   x = 927.61