Finding the Third Proportional to 19,515.75 and 42,111.75

Step by Step Solution

1. Step 1: Write the proportion equation
   19,515.75 : 42,111.75 = 42,111.75 : x
2. Step 2: Convert to fraction form
   19,515.75/42,111.75 = 42,111.75/x
3. Step 3: Cross multiply
   19,515.75x = 42,111.75 × 42,111.75
4. Step 4: Simplify right side
   19,515.75x = 1,773,399,488.06
5. Step 5: Solve for x
   x = 1,773,399,488.06/19,515.75
6. Step 6: Final answer
   x = 90,870.17