Finding the Third Proportional to 105,543 and 215,391

Step by Step Solution

1. Step 1: Write the proportion equation
   105,543 : 215,391 = 215,391 : x
2. Step 2: Convert to fraction form
   105,543/215,391 = 215,391/x
3. Step 3: Cross multiply
   105,543x = 215,391 × 215,391
4. Step 4: Simplify right side
   105,543x = 46,393,282,881
5. Step 5: Solve for x
   x = 46,393,282,881/105,543
6. Step 6: Final answer
   x = 439,567.60