Finding the Fourth Proportional to 1,685.05, 2,541.05 and 1,661.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.05 : 2,541.05 = 1,661.96 : x
2. Step 2: Convert to fraction form
   1,685.05/2,541.05 = 1,661.96/x
3. Step 3: Cross multiply
   1,685.05x = 2,541.05 × 1,661.96
4. Step 4: Simplify right side
   1,685.05x = 4,223,123.46
5. Step 5: Solve for x
   x = 4,223,123.46/1,685.05
6. Step 6: Final answer
   x = 2,506.23