Finding the Third Proportional to 657,216 and 990,697.50

Step by Step Solution

1. Step 1: Write the proportion equation
   657,216 : 990,697.50 = 990,697.50 : x
2. Step 2: Convert to fraction form
   657,216/990,697.50 = 990,697.50/x
3. Step 3: Cross multiply
   657,216x = 990,697.50 × 990,697.50
4. Step 4: Simplify right side
   657,216x = 981,481,536,506.25
5. Step 5: Solve for x
   x = 981,481,536,506.25/657,216
6. Step 6: Final answer
   x = 1,493,392.64