Finding the Third Proportional to 126,900 and 278,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   126,900 : 278,899.50 = 278,899.50 : x
2. Step 2: Convert to fraction form
   126,900/278,899.50 = 278,899.50/x
3. Step 3: Cross multiply
   126,900x = 278,899.50 × 278,899.50
4. Step 4: Simplify right side
   126,900x = 77,784,931,100.25
5. Step 5: Solve for x
   x = 77,784,931,100.25/126,900
6. Step 6: Final answer
   x = 612,962.42