Finding the Fourth Proportional to 1,145.69, 1,582.17 and 978.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.69 : 1,582.17 = 978.93 : x
2. Step 2: Convert to fraction form
   1,145.69/1,582.17 = 978.93/x
3. Step 3: Cross multiply
   1,145.69x = 1,582.17 × 978.93
4. Step 4: Simplify right side
   1,145.69x = 1,548,833.68
5. Step 5: Solve for x
   x = 1,548,833.68/1,145.69
6. Step 6: Final answer
   x = 1,351.88