Finding the Fourth Proportional to 404,648.40, 558,638.46 and 243,543

Step by Step Solution

1. Step 1: Write the proportion equation
   404,648.40 : 558,638.46 = 243,543 : x
2. Step 2: Convert to fraction form
   404,648.40/558,638.46 = 243,543/x
3. Step 3: Cross multiply
   404,648.40x = 558,638.46 × 243,543
4. Step 4: Simplify right side
   404,648.40x = 136,052,486,463.78
5. Step 5: Solve for x
   x = 136,052,486,463.78/404,648.40
6. Step 6: Final answer
   x = 336,223.96