Finding the Third Proportional to 66,992.50 and 139,498

Step by Step Solution

1. Step 1: Write the proportion equation
   66,992.50 : 139,498 = 139,498 : x
2. Step 2: Convert to fraction form
   66,992.50/139,498 = 139,498/x
3. Step 3: Cross multiply
   66,992.50x = 139,498 × 139,498
4. Step 4: Simplify right side
   66,992.50x = 19,459,692,004
5. Step 5: Solve for x
   x = 19,459,692,004/66,992.50
6. Step 6: Final answer
   x = 290,475.68