Finding the Third Proportional to 299,803.50 and 638,448

Step by Step Solution

1. Step 1: Write the proportion equation
   299,803.50 : 638,448 = 638,448 : x
2. Step 2: Convert to fraction form
   299,803.50/638,448 = 638,448/x
3. Step 3: Cross multiply
   299,803.50x = 638,448 × 638,448
4. Step 4: Simplify right side
   299,803.50x = 407,615,848,704
5. Step 5: Solve for x
   x = 407,615,848,704/299,803.50
6. Step 6: Final answer
   x = 1,359,610.04