Finding the Third Proportional to 508,510.50 and 690,615

Step by Step Solution

1. Step 1: Write the proportion equation
   508,510.50 : 690,615 = 690,615 : x
2. Step 2: Convert to fraction form
   508,510.50/690,615 = 690,615/x
3. Step 3: Cross multiply
   508,510.50x = 690,615 × 690,615
4. Step 4: Simplify right side
   508,510.50x = 476,949,078,225
5. Step 5: Solve for x
   x = 476,949,078,225/508,510.50
6. Step 6: Final answer
   x = 937,933.59