Finding the Third Proportional to 78,659 and 124,611.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,659 : 124,611.50 = 124,611.50 : x
2. Step 2: Convert to fraction form
   78,659/124,611.50 = 124,611.50/x
3. Step 3: Cross multiply
   78,659x = 124,611.50 × 124,611.50
4. Step 4: Simplify right side
   78,659x = 15,528,025,932.25
5. Step 5: Solve for x
   x = 15,528,025,932.25/78,659
6. Step 6: Final answer
   x = 197,409.40