Finding the Third Proportional to 111,657.75 and 243,358.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,657.75 : 243,358.50 = 243,358.50 : x
2. Step 2: Convert to fraction form
   111,657.75/243,358.50 = 243,358.50/x
3. Step 3: Cross multiply
   111,657.75x = 243,358.50 × 243,358.50
4. Step 4: Simplify right side
   111,657.75x = 59,223,359,522.25
5. Step 5: Solve for x
   x = 59,223,359,522.25/111,657.75
6. Step 6: Final answer
   x = 530,400.80