Finding the Third Proportional to 111,321 and 155,722.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,321 : 155,722.50 = 155,722.50 : x
2. Step 2: Convert to fraction form
   111,321/155,722.50 = 155,722.50/x
3. Step 3: Cross multiply
   111,321x = 155,722.50 × 155,722.50
4. Step 4: Simplify right side
   111,321x = 24,249,497,006.25
5. Step 5: Solve for x
   x = 24,249,497,006.25/111,321
6. Step 6: Final answer
   x = 217,833.98