Finding the Third Proportional to 67,990.50 and 147,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,990.50 : 147,280.50 = 147,280.50 : x
2. Step 2: Convert to fraction form
   67,990.50/147,280.50 = 147,280.50/x
3. Step 3: Cross multiply
   67,990.50x = 147,280.50 × 147,280.50
4. Step 4: Simplify right side
   67,990.50x = 21,691,545,680.25
5. Step 5: Solve for x
   x = 21,691,545,680.25/67,990.50
6. Step 6: Final answer
   x = 319,037.89