Finding the Third Proportional to 59,287,290 and 128,469,840

Step by Step Solution

1. Step 1: Write the proportion equation
   59,287,290 : 128,469,840 = 128,469,840 : x
2. Step 2: Convert to fraction form
   59,287,290/128,469,840 = 128,469,840/x
3. Step 3: Cross multiply
   59,287,290x = 128,469,840 × 128,469,840
4. Step 4: Simplify right side
   59,287,290x = 16,504,499,789,625,600
5. Step 5: Solve for x
   x = 16,504,499,789,625,600/59,287,290
6. Step 6: Final answer
   x = 278,381,754.16