Finding the Third Proportional to 111,890 and 243,258

Step by Step Solution

1. Step 1: Write the proportion equation
   111,890 : 243,258 = 243,258 : x
2. Step 2: Convert to fraction form
   111,890/243,258 = 243,258/x
3. Step 3: Cross multiply
   111,890x = 243,258 × 243,258
4. Step 4: Simplify right side
   111,890x = 59,174,454,564
5. Step 5: Solve for x
   x = 59,174,454,564/111,890
6. Step 6: Final answer
   x = 528,862.76