Finding the Third Proportional to 111,712 and 231,200

Step by Step Solution

1. Step 1: Write the proportion equation
   111,712 : 231,200 = 231,200 : x
2. Step 2: Convert to fraction form
   111,712/231,200 = 231,200/x
3. Step 3: Cross multiply
   111,712x = 231,200 × 231,200
4. Step 4: Simplify right side
   111,712x = 53,453,440,000
5. Step 5: Solve for x
   x = 53,453,440,000/111,712
6. Step 6: Final answer
   x = 478,493.27