Finding the Fourth Proportional to 1,071.16, 1,478.10 and 678.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.16 : 1,478.10 = 678.04 : x
2. Step 2: Convert to fraction form
   1,071.16/1,478.10 = 678.04/x
3. Step 3: Cross multiply
   1,071.16x = 1,478.10 × 678.04
4. Step 4: Simplify right side
   1,071.16x = 1,002,210.92
5. Step 5: Solve for x
   x = 1,002,210.92/1,071.16
6. Step 6: Final answer
   x = 935.63