Finding the Third Proportional to 508,499 and 690,605.50

Step by Step Solution

1. Step 1: Write the proportion equation
   508,499 : 690,605.50 = 690,605.50 : x
2. Step 2: Convert to fraction form
   508,499/690,605.50 = 690,605.50/x
3. Step 3: Cross multiply
   508,499x = 690,605.50 × 690,605.50
4. Step 4: Simplify right side
   508,499x = 476,935,956,630.25
5. Step 5: Solve for x
   x = 476,935,956,630.25/508,499
6. Step 6: Final answer
   x = 937,929.00