Finding the Fourth Proportional to 1,623.86, 2,436.72 and 686.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,623.86 : 2,436.72 = 686.73 : x
2. Step 2: Convert to fraction form
   1,623.86/2,436.72 = 686.73/x
3. Step 3: Cross multiply
   1,623.86x = 2,436.72 × 686.73
4. Step 4: Simplify right side
   1,623.86x = 1,673,368.73
5. Step 5: Solve for x
   x = 1,673,368.73/1,623.86
6. Step 6: Final answer
   x = 1,030.49