Finding the Third Proportional to 388,272 and 830,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,272 : 830,520.50 = 830,520.50 : x
2. Step 2: Convert to fraction form
   388,272/830,520.50 = 830,520.50/x
3. Step 3: Cross multiply
   388,272x = 830,520.50 × 830,520.50
4. Step 4: Simplify right side
   388,272x = 689,764,300,920.25
5. Step 5: Solve for x
   x = 689,764,300,920.25/388,272
6. Step 6: Final answer
   x = 1,776,497.66