Finding the Third Proportional to 311,769 and 671,611.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,769 : 671,611.50 = 671,611.50 : x
2. Step 2: Convert to fraction form
   311,769/671,611.50 = 671,611.50/x
3. Step 3: Cross multiply
   311,769x = 671,611.50 × 671,611.50
4. Step 4: Simplify right side
   311,769x = 451,062,006,932.25
5. Step 5: Solve for x
   x = 451,062,006,932.25/311,769
6. Step 6: Final answer
   x = 1,446,782.74