Finding the Third Proportional to 210,718 and 456,428

Step by Step Solution

1. Step 1: Write the proportion equation
   210,718 : 456,428 = 456,428 : x
2. Step 2: Convert to fraction form
   210,718/456,428 = 456,428/x
3. Step 3: Cross multiply
   210,718x = 456,428 × 456,428
4. Step 4: Simplify right side
   210,718x = 208,326,519,184
5. Step 5: Solve for x
   x = 208,326,519,184/210,718
6. Step 6: Final answer
   x = 988,650.80