Finding the Fourth Proportional to 1,105.15, 1,657.72 and 617.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.15 : 1,657.72 = 617.93 : x
2. Step 2: Convert to fraction form
   1,105.15/1,657.72 = 617.93/x
3. Step 3: Cross multiply
   1,105.15x = 1,657.72 × 617.93
4. Step 4: Simplify right side
   1,105.15x = 1,024,353.37
5. Step 5: Solve for x
   x = 1,024,353.37/1,105.15
6. Step 6: Final answer
   x = 926.90