Finding the Third Proportional to 59,458.50 and 128,637

Step by Step Solution

1. Step 1: Write the proportion equation
   59,458.50 : 128,637 = 128,637 : x
2. Step 2: Convert to fraction form
   59,458.50/128,637 = 128,637/x
3. Step 3: Cross multiply
   59,458.50x = 128,637 × 128,637
4. Step 4: Simplify right side
   59,458.50x = 16,547,477,769
5. Step 5: Solve for x
   x = 16,547,477,769/59,458.50
6. Step 6: Final answer
   x = 278,302.98