Finding the Fourth Proportional to 1,171.69, 1,616.01 and 1,045.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.69 : 1,616.01 = 1,045.78 : x
2. Step 2: Convert to fraction form
   1,171.69/1,616.01 = 1,045.78/x
3. Step 3: Cross multiply
   1,171.69x = 1,616.01 × 1,045.78
4. Step 4: Simplify right side
   1,171.69x = 1,689,990.94
5. Step 5: Solve for x
   x = 1,689,990.94/1,171.69
6. Step 6: Final answer
   x = 1,442.35