Finding the Third Proportional to 338,418 and 440,437.50

Step by Step Solution

1. Step 1: Write the proportion equation
   338,418 : 440,437.50 = 440,437.50 : x
2. Step 2: Convert to fraction form
   338,418/440,437.50 = 440,437.50/x
3. Step 3: Cross multiply
   338,418x = 440,437.50 × 440,437.50
4. Step 4: Simplify right side
   338,418x = 193,985,191,406.25
5. Step 5: Solve for x
   x = 193,985,191,406.25/338,418
6. Step 6: Final answer
   x = 573,211.80