Finding the Third Proportional to 99,600 and 208,428

Step by Step Solution

1. Step 1: Write the proportion equation
   99,600 : 208,428 = 208,428 : x
2. Step 2: Convert to fraction form
   99,600/208,428 = 208,428/x
3. Step 3: Cross multiply
   99,600x = 208,428 × 208,428
4. Step 4: Simplify right side
   99,600x = 43,442,231,184
5. Step 5: Solve for x
   x = 43,442,231,184/99,600
6. Step 6: Final answer
   x = 436,166.98