Finding the Fourth Proportional to 1,764.72, 2,436.72 and 1,685.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.72 : 2,436.72 = 1,685.40 : x
2. Step 2: Convert to fraction form
   1,764.72/2,436.72 = 1,685.40/x
3. Step 3: Cross multiply
   1,764.72x = 2,436.72 × 1,685.40
4. Step 4: Simplify right side
   1,764.72x = 4,106,847.89
5. Step 5: Solve for x
   x = 4,106,847.89/1,764.72
6. Step 6: Final answer
   x = 2,327.20