Finding the Fourth Proportional to 1,123.81, 1,685.85 and 302.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.81 : 1,685.85 = 302.10 : x
2. Step 2: Convert to fraction form
   1,123.81/1,685.85 = 302.10/x
3. Step 3: Cross multiply
   1,123.81x = 1,685.85 × 302.10
4. Step 4: Simplify right side
   1,123.81x = 509,287.83
5. Step 5: Solve for x
   x = 509,287.83/1,123.81
6. Step 6: Final answer
   x = 453.18