Finding the Third Proportional to 68,219.50 and 139,820

Step by Step Solution

1. Step 1: Write the proportion equation
   68,219.50 : 139,820 = 139,820 : x
2. Step 2: Convert to fraction form
   68,219.50/139,820 = 139,820/x
3. Step 3: Cross multiply
   68,219.50x = 139,820 × 139,820
4. Step 4: Simplify right side
   68,219.50x = 19,549,632,400
5. Step 5: Solve for x
   x = 19,549,632,400/68,219.50
6. Step 6: Final answer
   x = 286,569.56