Finding the Third Proportional to 9,210 and 19,891.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,210 : 19,891.50 = 19,891.50 : x
2. Step 2: Convert to fraction form
   9,210/19,891.50 = 19,891.50/x
3. Step 3: Cross multiply
   9,210x = 19,891.50 × 19,891.50
4. Step 4: Simplify right side
   9,210x = 395,671,772.25
5. Step 5: Solve for x
   x = 395,671,772.25/9,210
6. Step 6: Final answer
   x = 42,961.10