Finding the Third Proportional to 66,610.50 and 139,379

Step by Step Solution

1. Step 1: Write the proportion equation
   66,610.50 : 139,379 = 139,379 : x
2. Step 2: Convert to fraction form
   66,610.50/139,379 = 139,379/x
3. Step 3: Cross multiply
   66,610.50x = 139,379 × 139,379
4. Step 4: Simplify right side
   66,610.50x = 19,426,505,641
5. Step 5: Solve for x
   x = 19,426,505,641/66,610.50
6. Step 6: Final answer
   x = 291,643.29