Finding the Third Proportional to 221,657.50 and 334,128

Step by Step Solution

1. Step 1: Write the proportion equation
   221,657.50 : 334,128 = 334,128 : x
2. Step 2: Convert to fraction form
   221,657.50/334,128 = 334,128/x
3. Step 3: Cross multiply
   221,657.50x = 334,128 × 334,128
4. Step 4: Simplify right side
   221,657.50x = 111,641,520,384
5. Step 5: Solve for x
   x = 111,641,520,384/221,657.50
6. Step 6: Final answer
   x = 503,666.78