Finding the Third Proportional to 77,989.50 and 123,970.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,989.50 : 123,970.50 = 123,970.50 : x
2. Step 2: Convert to fraction form
   77,989.50/123,970.50 = 123,970.50/x
3. Step 3: Cross multiply
   77,989.50x = 123,970.50 × 123,970.50
4. Step 4: Simplify right side
   77,989.50x = 15,368,684,870.25
5. Step 5: Solve for x
   x = 15,368,684,870.25/77,989.50
6. Step 6: Final answer
   x = 197,060.95