Finding the Fourth Proportional to 1,092.96, 1,638.42 and 399.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.96 : 1,638.42 = 399.46 : x
2. Step 2: Convert to fraction form
   1,092.96/1,638.42 = 399.46/x
3. Step 3: Cross multiply
   1,092.96x = 1,638.42 × 399.46
4. Step 4: Simplify right side
   1,092.96x = 654,483.25
5. Step 5: Solve for x
   x = 654,483.25/1,092.96
6. Step 6: Final answer
   x = 598.82