Finding the Third Proportional to 56,686.50 and 123,579.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,686.50 : 123,579.50 = 123,579.50 : x
2. Step 2: Convert to fraction form
   56,686.50/123,579.50 = 123,579.50/x
3. Step 3: Cross multiply
   56,686.50x = 123,579.50 × 123,579.50
4. Step 4: Simplify right side
   56,686.50x = 15,271,892,820.25
5. Step 5: Solve for x
   x = 15,271,892,820.25/56,686.50
6. Step 6: Final answer
   x = 269,409.70