Finding the Fourth Proportional to 1,678.16, 2,315.78 and 932.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.16 : 2,315.78 = 932.12 : x
2. Step 2: Convert to fraction form
   1,678.16/2,315.78 = 932.12/x
3. Step 3: Cross multiply
   1,678.16x = 2,315.78 × 932.12
4. Step 4: Simplify right side
   1,678.16x = 2,158,568.61
5. Step 5: Solve for x
   x = 2,158,568.61/1,678.16
6. Step 6: Final answer
   x = 1,286.27