Finding the Third Proportional to 19,789.88 and 40,385.53

Step by Step Solution

1. Step 1: Write the proportion equation
   19,789.88 : 40,385.53 = 40,385.53 : x
2. Step 2: Convert to fraction form
   19,789.88/40,385.53 = 40,385.53/x
3. Step 3: Cross multiply
   19,789.88x = 40,385.53 × 40,385.53
4. Step 4: Simplify right side
   19,789.88x = 1,630,991,134.34
5. Step 5: Solve for x
   x = 1,630,991,134.34/19,789.88
6. Step 6: Final answer
   x = 82,415.43