Finding the Third Proportional to 280,434 and 435,054

Step by Step Solution

1. Step 1: Write the proportion equation
   280,434 : 435,054 = 435,054 : x
2. Step 2: Convert to fraction form
   280,434/435,054 = 435,054/x
3. Step 3: Cross multiply
   280,434x = 435,054 × 435,054
4. Step 4: Simplify right side
   280,434x = 189,271,982,916
5. Step 5: Solve for x
   x = 189,271,982,916/280,434
6. Step 6: Final answer
   x = 674,925.23