Finding the Fourth Proportional to 1,071.82, 1,478.55 and 678.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.82 : 1,478.55 = 678.16 : x
2. Step 2: Convert to fraction form
   1,071.82/1,478.55 = 678.16/x
3. Step 3: Cross multiply
   1,071.82x = 1,478.55 × 678.16
4. Step 4: Simplify right side
   1,071.82x = 1,002,693.47
5. Step 5: Solve for x
   x = 1,002,693.47/1,071.82
6. Step 6: Final answer
   x = 935.51