Finding the Fourth Proportional to 1,275.69, 1,911.93 and 582.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.69 : 1,911.93 = 582.15 : x
2. Step 2: Convert to fraction form
   1,275.69/1,911.93 = 582.15/x
3. Step 3: Cross multiply
   1,275.69x = 1,911.93 × 582.15
4. Step 4: Simplify right side
   1,275.69x = 1,113,030.05
5. Step 5: Solve for x
   x = 1,113,030.05/1,275.69
6. Step 6: Final answer
   x = 872.49