Finding the Third Proportional to 388,906.31 and 831,758.63

Step by Step Solution

1. Step 1: Write the proportion equation
   388,906.31 : 831,758.63 = 831,758.63 : x
2. Step 2: Convert to fraction form
   388,906.31/831,758.63 = 831,758.63/x
3. Step 3: Cross multiply
   388,906.31x = 831,758.63 × 831,758.63
4. Step 4: Simplify right side
   388,906.31x = 691,822,410,261.89
5. Step 5: Solve for x
   x = 691,822,410,261.89/388,906.31
6. Step 6: Final answer
   x = 1,778,892.21