Finding the Third Proportional to 19,389.87 and 42,109.89

Step by Step Solution

1. Step 1: Write the proportion equation
   19,389.87 : 42,109.89 = 42,109.89 : x
2. Step 2: Convert to fraction form
   19,389.87/42,109.89 = 42,109.89/x
3. Step 3: Cross multiply
   19,389.87x = 42,109.89 × 42,109.89
4. Step 4: Simplify right side
   19,389.87x = 1,773,243,237.99
5. Step 5: Solve for x
   x = 1,773,243,237.99/19,389.87
6. Step 6: Final answer
   x = 91,452.05