Finding the Third Proportional to 67,391 and 99,772.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,391 : 99,772.50 = 99,772.50 : x
2. Step 2: Convert to fraction form
   67,391/99,772.50 = 99,772.50/x
3. Step 3: Cross multiply
   67,391x = 99,772.50 × 99,772.50
4. Step 4: Simplify right side
   67,391x = 9,954,551,756.25
5. Step 5: Solve for x
   x = 9,954,551,756.25/67,391
6. Step 6: Final answer
   x = 147,713.37