Finding the Third Proportional to 400,111.50 and 619,338

Step by Step Solution

1. Step 1: Write the proportion equation
   400,111.50 : 619,338 = 619,338 : x
2. Step 2: Convert to fraction form
   400,111.50/619,338 = 619,338/x
3. Step 3: Cross multiply
   400,111.50x = 619,338 × 619,338
4. Step 4: Simplify right side
   400,111.50x = 383,579,558,244
5. Step 5: Solve for x
   x = 383,579,558,244/400,111.50
6. Step 6: Final answer
   x = 958,681.66