Finding the Fourth Proportional to 1,077.84, 1,487.16 and 684.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.84 : 1,487.16 = 684.72 : x
2. Step 2: Convert to fraction form
   1,077.84/1,487.16 = 684.72/x
3. Step 3: Cross multiply
   1,077.84x = 1,487.16 × 684.72
4. Step 4: Simplify right side
   1,077.84x = 1,018,288.20
5. Step 5: Solve for x
   x = 1,018,288.20/1,077.84
6. Step 6: Final answer
   x = 944.75