Finding the Third Proportional to 280,611 and 427,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   280,611 : 427,921.50 = 427,921.50 : x
2. Step 2: Convert to fraction form
   280,611/427,921.50 = 427,921.50/x
3. Step 3: Cross multiply
   280,611x = 427,921.50 × 427,921.50
4. Step 4: Simplify right side
   280,611x = 183,116,810,162.25
5. Step 5: Solve for x
   x = 183,116,810,162.25/280,611
6. Step 6: Final answer
   x = 652,564.62