Finding the Third Proportional to 388,354.50 and 830,677.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,354.50 : 830,677.50 = 830,677.50 : x
2. Step 2: Convert to fraction form
   388,354.50/830,677.50 = 830,677.50/x
3. Step 3: Cross multiply
   388,354.50x = 830,677.50 × 830,677.50
4. Step 4: Simplify right side
   388,354.50x = 690,025,109,006.25
5. Step 5: Solve for x
   x = 690,025,109,006.25/388,354.50
6. Step 6: Final answer
   x = 1,776,791.85