Finding the Third Proportional to 99,912 and 209,061

Step by Step Solution

1. Step 1: Write the proportion equation
   99,912 : 209,061 = 209,061 : x
2. Step 2: Convert to fraction form
   99,912/209,061 = 209,061/x
3. Step 3: Cross multiply
   99,912x = 209,061 × 209,061
4. Step 4: Simplify right side
   99,912x = 43,706,501,721
5. Step 5: Solve for x
   x = 43,706,501,721/99,912
6. Step 6: Final answer
   x = 437,449.97