Finding the Third Proportional to 111,158 and 243,921

Step by Step Solution

1. Step 1: Write the proportion equation
   111,158 : 243,921 = 243,921 : x
2. Step 2: Convert to fraction form
   111,158/243,921 = 243,921/x
3. Step 3: Cross multiply
   111,158x = 243,921 × 243,921
4. Step 4: Simplify right side
   111,158x = 59,497,454,241
5. Step 5: Solve for x
   x = 59,497,454,241/111,158
6. Step 6: Final answer
   x = 535,251.21