Finding the Fourth Proportional to 1,145.86, 1,715.20 and 885.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.86 : 1,715.20 = 885.18 : x
2. Step 2: Convert to fraction form
   1,145.86/1,715.20 = 885.18/x
3. Step 3: Cross multiply
   1,145.86x = 1,715.20 × 885.18
4. Step 4: Simplify right side
   1,145.86x = 1,518,260.74
5. Step 5: Solve for x
   x = 1,518,260.74/1,145.86
6. Step 6: Final answer
   x = 1,325.00