Finding the Fourth Proportional to 1,215.59, 1,677.46 and 684.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.59 : 1,677.46 = 684.48 : x
2. Step 2: Convert to fraction form
   1,215.59/1,677.46 = 684.48/x
3. Step 3: Cross multiply
   1,215.59x = 1,677.46 × 684.48
4. Step 4: Simplify right side
   1,215.59x = 1,148,184.40
5. Step 5: Solve for x
   x = 1,148,184.40/1,215.59
6. Step 6: Final answer
   x = 944.55