Finding the Third Proportional to 612,261 and 919,021.50

Step by Step Solution

1. Step 1: Write the proportion equation
   612,261 : 919,021.50 = 919,021.50 : x
2. Step 2: Convert to fraction form
   612,261/919,021.50 = 919,021.50/x
3. Step 3: Cross multiply
   612,261x = 919,021.50 × 919,021.50
4. Step 4: Simplify right side
   612,261x = 844,600,517,462.25
5. Step 5: Solve for x
   x = 844,600,517,462.25/612,261
6. Step 6: Final answer
   x = 1,379,477.90