Finding the Third Proportional to 99,910 and 209,056

Step by Step Solution

1. Step 1: Write the proportion equation
   99,910 : 209,056 = 209,056 : x
2. Step 2: Convert to fraction form
   99,910/209,056 = 209,056/x
3. Step 3: Cross multiply
   99,910x = 209,056 × 209,056
4. Step 4: Simplify right side
   99,910x = 43,704,411,136
5. Step 5: Solve for x
   x = 43,704,411,136/99,910
6. Step 6: Final answer
   x = 437,437.81