Finding the Third Proportional to 543,123 and 823,432.50

Step by Step Solution

1. Step 1: Write the proportion equation
   543,123 : 823,432.50 = 823,432.50 : x
2. Step 2: Convert to fraction form
   543,123/823,432.50 = 823,432.50/x
3. Step 3: Cross multiply
   543,123x = 823,432.50 × 823,432.50
4. Step 4: Simplify right side
   543,123x = 678,041,082,056.25
5. Step 5: Solve for x
   x = 678,041,082,056.25/543,123
6. Step 6: Final answer
   x = 1,248,411.65