Finding the Fourth Proportional to 90,693.82, 135,642.81 and 80,768.56

Step by Step Solution

1. Step 1: Write the proportion equation
   90,693.82 : 135,642.81 = 80,768.56 : x
2. Step 2: Convert to fraction form
   90,693.82/135,642.81 = 80,768.56/x
3. Step 3: Cross multiply
   90,693.82x = 135,642.81 × 80,768.56
4. Step 4: Simplify right side
   90,693.82x = 10,955,674,401.83
5. Step 5: Solve for x
   x = 10,955,674,401.83/90,693.82
6. Step 6: Final answer
   x = 120,798.47