Finding the Third Proportional to 111,547 and 243,403

Step by Step Solution

1. Step 1: Write the proportion equation
   111,547 : 243,403 = 243,403 : x
2. Step 2: Convert to fraction form
   111,547/243,403 = 243,403/x
3. Step 3: Cross multiply
   111,547x = 243,403 × 243,403
4. Step 4: Simplify right side
   111,547x = 59,245,020,409
5. Step 5: Solve for x
   x = 59,245,020,409/111,547
6. Step 6: Final answer
   x = 531,121.59