Finding the Fourth Proportional to 90,665.02, 135,086.27 and 85,571.94

Step by Step Solution

1. Step 1: Write the proportion equation
   90,665.02 : 135,086.27 = 85,571.94 : x
2. Step 2: Convert to fraction form
   90,665.02/135,086.27 = 85,571.94/x
3. Step 3: Cross multiply
   90,665.02x = 135,086.27 × 85,571.94
4. Step 4: Simplify right side
   90,665.02x = 11,559,593,763.40
5. Step 5: Solve for x
   x = 11,559,593,763.40/90,665.02
6. Step 6: Final answer
   x = 127,497.84