Finding the Third Proportional to 67,990 and 147,279.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,990 : 147,279.50 = 147,279.50 : x
2. Step 2: Convert to fraction form
   67,990/147,279.50 = 147,279.50/x
3. Step 3: Cross multiply
   67,990x = 147,279.50 × 147,279.50
4. Step 4: Simplify right side
   67,990x = 21,691,251,120.25
5. Step 5: Solve for x
   x = 21,691,251,120.25/67,990
6. Step 6: Final answer
   x = 319,035.90