Finding the Third Proportional to 120,112.50 and 278,028

Step by Step Solution

1. Step 1: Write the proportion equation
   120,112.50 : 278,028 = 278,028 : x
2. Step 2: Convert to fraction form
   120,112.50/278,028 = 278,028/x
3. Step 3: Cross multiply
   120,112.50x = 278,028 × 278,028
4. Step 4: Simplify right side
   120,112.50x = 77,299,568,784
5. Step 5: Solve for x
   x = 77,299,568,784/120,112.50
6. Step 6: Final answer
   x = 643,559.74