Finding the Third Proportional to 67,989 and 145,820.25

Step by Step Solution

1. Step 1: Write the proportion equation
   67,989 : 145,820.25 = 145,820.25 : x
2. Step 2: Convert to fraction form
   67,989/145,820.25 = 145,820.25/x
3. Step 3: Cross multiply
   67,989x = 145,820.25 × 145,820.25
4. Step 4: Simplify right side
   67,989x = 21,263,545,310.06
5. Step 5: Solve for x
   x = 21,263,545,310.06/67,989
6. Step 6: Final answer
   x = 312,749.79