Finding the Third Proportional to 111,688 and 243,457.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,688 : 243,457.50 = 243,457.50 : x
2. Step 2: Convert to fraction form
   111,688/243,457.50 = 243,457.50/x
3. Step 3: Cross multiply
   111,688x = 243,457.50 × 243,457.50
4. Step 4: Simplify right side
   111,688x = 59,271,554,306.25
5. Step 5: Solve for x
   x = 59,271,554,306.25/111,688
6. Step 6: Final answer
   x = 530,688.65