Finding the Fourth Proportional to 1,215.53, 1,677.38 and 684.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.53 : 1,677.38 = 684.42 : x
2. Step 2: Convert to fraction form
   1,215.53/1,677.38 = 684.42/x
3. Step 3: Cross multiply
   1,215.53x = 1,677.38 × 684.42
4. Step 4: Simplify right side
   1,215.53x = 1,148,029.00
5. Step 5: Solve for x
   x = 1,148,029.00/1,215.53
6. Step 6: Final answer
   x = 944.47