Finding the Fourth Proportional to 1,105.17, 1,516.98 and 1,057.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.17 : 1,516.98 = 1,057.65 : x
2. Step 2: Convert to fraction form
   1,105.17/1,516.98 = 1,057.65/x
3. Step 3: Cross multiply
   1,105.17x = 1,516.98 × 1,057.65
4. Step 4: Simplify right side
   1,105.17x = 1,604,433.90
5. Step 5: Solve for x
   x = 1,604,433.90/1,105.17
6. Step 6: Final answer
   x = 1,451.75