Finding the Fourth Proportional to 1,145.69, 1,715.12 and 1,126.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.69 : 1,715.12 = 1,126.10 : x
2. Step 2: Convert to fraction form
   1,145.69/1,715.12 = 1,126.10/x
3. Step 3: Cross multiply
   1,145.69x = 1,715.12 × 1,126.10
4. Step 4: Simplify right side
   1,145.69x = 1,931,405.85
5. Step 5: Solve for x
   x = 1,931,405.85/1,145.69
6. Step 6: Final answer
   x = 1,685.79