Finding the Third Proportional to 99,918 and 209,071.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,918 : 209,071.50 = 209,071.50 : x
2. Step 2: Convert to fraction form
   99,918/209,071.50 = 209,071.50/x
3. Step 3: Cross multiply
   99,918x = 209,071.50 × 209,071.50
4. Step 4: Simplify right side
   99,918x = 43,710,892,112.25
5. Step 5: Solve for x
   x = 43,710,892,112.25/99,918
6. Step 6: Final answer
   x = 437,467.64