Finding the Fourth Proportional to 1,215.52, 1,677.56 and 684.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.52 : 1,677.56 = 684.41 : x
2. Step 2: Convert to fraction form
   1,215.52/1,677.56 = 684.41/x
3. Step 3: Cross multiply
   1,215.52x = 1,677.56 × 684.41
4. Step 4: Simplify right side
   1,215.52x = 1,148,127.03
5. Step 5: Solve for x
   x = 1,148,127.03/1,215.52
6. Step 6: Final answer
   x = 944.56