Finding the Third Proportional to 59,116.50 and 128,280

Step by Step Solution

1. Step 1: Write the proportion equation
   59,116.50 : 128,280 = 128,280 : x
2. Step 2: Convert to fraction form
   59,116.50/128,280 = 128,280/x
3. Step 3: Cross multiply
   59,116.50x = 128,280 × 128,280
4. Step 4: Simplify right side
   59,116.50x = 16,455,758,400
5. Step 5: Solve for x
   x = 16,455,758,400/59,116.50
6. Step 6: Final answer
   x = 278,361.51