Finding the Third Proportional to 19,898,456 and 42,188,320

Step by Step Solution

1. Step 1: Write the proportion equation
   19,898,456 : 42,188,320 = 42,188,320 : x
2. Step 2: Convert to fraction form
   19,898,456/42,188,320 = 42,188,320/x
3. Step 3: Cross multiply
   19,898,456x = 42,188,320 × 42,188,320
4. Step 4: Simplify right side
   19,898,456x = 1,779,854,344,422,400
5. Step 5: Solve for x
   x = 1,779,854,344,422,400/19,898,456
6. Step 6: Final answer
   x = 89,446,856.80