Finding the Third Proportional to 5,128,776 and 8,121,294

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128,776 : 8,121,294 = 8,121,294 : x
2. Step 2: Convert to fraction form
   5,128,776/8,121,294 = 8,121,294/x
3. Step 3: Cross multiply
   5,128,776x = 8,121,294 × 8,121,294
4. Step 4: Simplify right side
   5,128,776x = 65,955,416,234,436
5. Step 5: Solve for x
   x = 65,955,416,234,436/5,128,776
6. Step 6: Final answer
   x = 12,859,874.60