Finding the Fourth Proportional to 1,623.65, 2,436.83 and 699.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,623.65 : 2,436.83 = 699.89 : x
2. Step 2: Convert to fraction form
   1,623.65/2,436.83 = 699.89/x
3. Step 3: Cross multiply
   1,623.65x = 2,436.83 × 699.89
4. Step 4: Simplify right side
   1,623.65x = 1,705,517.53
5. Step 5: Solve for x
   x = 1,705,517.53/1,623.65
6. Step 6: Final answer
   x = 1,050.43