Finding the Third Proportional to 100,521.75 and 209,310

Step by Step Solution

1. Step 1: Write the proportion equation
   100,521.75 : 209,310 = 209,310 : x
2. Step 2: Convert to fraction form
   100,521.75/209,310 = 209,310/x
3. Step 3: Cross multiply
   100,521.75x = 209,310 × 209,310
4. Step 4: Simplify right side
   100,521.75x = 43,810,676,100
5. Step 5: Solve for x
   x = 43,810,676,100/100,521.75
6. Step 6: Final answer
   x = 435,832.80