Finding the Fourth Proportional to 1,077.62, 1,487.06 and 678.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.62 : 1,487.06 = 678.82 : x
2. Step 2: Convert to fraction form
   1,077.62/1,487.06 = 678.82/x
3. Step 3: Cross multiply
   1,077.62x = 1,487.06 × 678.82
4. Step 4: Simplify right side
   1,077.62x = 1,009,446.07
5. Step 5: Solve for x
   x = 1,009,446.07/1,077.62
6. Step 6: Final answer
   x = 936.74