Finding the Fourth Proportional to 1,393.74, 2,091.62 and 1,123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.74 : 2,091.62 = 1,123.10 : x
2. Step 2: Convert to fraction form
   1,393.74/2,091.62 = 1,123.10/x
3. Step 3: Cross multiply
   1,393.74x = 2,091.62 × 1,123.10
4. Step 4: Simplify right side
   1,393.74x = 2,349,082.35
5. Step 5: Solve for x
   x = 2,349,082.35/1,393.74
6. Step 6: Final answer
   x = 1,685.45