Finding the Third Proportional to 688,404.50 and 1,491,218

Step by Step Solution

1. Step 1: Write the proportion equation
   688,404.50 : 1,491,218 = 1,491,218 : x
2. Step 2: Convert to fraction form
   688,404.50/1,491,218 = 1,491,218/x
3. Step 3: Cross multiply
   688,404.50x = 1,491,218 × 1,491,218
4. Step 4: Simplify right side
   688,404.50x = 2,223,731,123,524
5. Step 5: Solve for x
   x = 2,223,731,123,524/688,404.50
6. Step 6: Final answer
   x = 3,230,268.14