Finding the Third Proportional to 66,994.50 and 139,502

Step by Step Solution

1. Step 1: Write the proportion equation
   66,994.50 : 139,502 = 139,502 : x
2. Step 2: Convert to fraction form
   66,994.50/139,502 = 139,502/x
3. Step 3: Cross multiply
   66,994.50x = 139,502 × 139,502
4. Step 4: Simplify right side
   66,994.50x = 19,460,808,004
5. Step 5: Solve for x
   x = 19,460,808,004/66,994.50
6. Step 6: Final answer
   x = 290,483.67