Finding the Third Proportional to 423,544 and 621,187.50

Step by Step Solution

1. Step 1: Write the proportion equation
   423,544 : 621,187.50 = 621,187.50 : x
2. Step 2: Convert to fraction form
   423,544/621,187.50 = 621,187.50/x
3. Step 3: Cross multiply
   423,544x = 621,187.50 × 621,187.50
4. Step 4: Simplify right side
   423,544x = 385,873,910,156.25
5. Step 5: Solve for x
   x = 385,873,910,156.25/423,544
6. Step 6: Final answer
   x = 911,059.80