Finding the Third Proportional to 42,315.75 and 91,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,315.75 : 91,921.50 = 91,921.50 : x
2. Step 2: Convert to fraction form
   42,315.75/91,921.50 = 91,921.50/x
3. Step 3: Cross multiply
   42,315.75x = 91,921.50 × 91,921.50
4. Step 4: Simplify right side
   42,315.75x = 8,449,562,162.25
5. Step 5: Solve for x
   x = 8,449,562,162.25/42,315.75
6. Step 6: Final answer
   x = 199,678.89