Finding the Fourth Proportional to 1,127.16, 1,554.83 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.16 : 1,554.83 = 678.72 : x
2. Step 2: Convert to fraction form
   1,127.16/1,554.83 = 678.72/x
3. Step 3: Cross multiply
   1,127.16x = 1,554.83 × 678.72
4. Step 4: Simplify right side
   1,127.16x = 1,055,294.22
5. Step 5: Solve for x
   x = 1,055,294.22/1,127.16
6. Step 6: Final answer
   x = 936.24