Finding the Third Proportional to 86,422.50 and 129,636

Step by Step Solution

1. Step 1: Write the proportion equation
   86,422.50 : 129,636 = 129,636 : x
2. Step 2: Convert to fraction form
   86,422.50/129,636 = 129,636/x
3. Step 3: Cross multiply
   86,422.50x = 129,636 × 129,636
4. Step 4: Simplify right side
   86,422.50x = 16,805,492,496
5. Step 5: Solve for x
   x = 16,805,492,496/86,422.50
6. Step 6: Final answer
   x = 194,457.38