Finding the Third Proportional to 19,987.31 and 42,999.75

Step by Step Solution

1. Step 1: Write the proportion equation
   19,987.31 : 42,999.75 = 42,999.75 : x
2. Step 2: Convert to fraction form
   19,987.31/42,999.75 = 42,999.75/x
3. Step 3: Cross multiply
   19,987.31x = 42,999.75 × 42,999.75
4. Step 4: Simplify right side
   19,987.31x = 1,848,978,500.06
5. Step 5: Solve for x
   x = 1,848,978,500.06/19,987.31
6. Step 6: Final answer
   x = 92,507.61