Finding the Fourth Proportional to 1,643.31, 2,462.40 and 1,123.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.31 : 2,462.40 = 1,123.56 : x
2. Step 2: Convert to fraction form
   1,643.31/2,462.40 = 1,123.56/x
3. Step 3: Cross multiply
   1,643.31x = 2,462.40 × 1,123.56
4. Step 4: Simplify right side
   1,643.31x = 2,766,654.14
5. Step 5: Solve for x
   x = 2,766,654.14/1,643.31
6. Step 6: Final answer
   x = 1,683.59