Finding the Fourth Proportional to 1,085.86, 1,625.46 and 715.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.86 : 1,625.46 = 715.24 : x
2. Step 2: Convert to fraction form
   1,085.86/1,625.46 = 715.24/x
3. Step 3: Cross multiply
   1,085.86x = 1,625.46 × 715.24
4. Step 4: Simplify right side
   1,085.86x = 1,162,594.01
5. Step 5: Solve for x
   x = 1,162,594.01/1,085.86
6. Step 6: Final answer
   x = 1,070.67