Finding the Third Proportional to 59,485.50 and 128,772

Step by Step Solution

1. Step 1: Write the proportion equation
   59,485.50 : 128,772 = 128,772 : x
2. Step 2: Convert to fraction form
   59,485.50/128,772 = 128,772/x
3. Step 3: Cross multiply
   59,485.50x = 128,772 × 128,772
4. Step 4: Simplify right side
   59,485.50x = 16,582,227,984
5. Step 5: Solve for x
   x = 16,582,227,984/59,485.50
6. Step 6: Final answer
   x = 278,760.84