Finding the Fourth Proportional to 90,019.35, 124,261.70 and 80,571.51

Step by Step Solution

1. Step 1: Write the proportion equation
   90,019.35 : 124,261.70 = 80,571.51 : x
2. Step 2: Convert to fraction form
   90,019.35/124,261.70 = 80,571.51/x
3. Step 3: Cross multiply
   90,019.35x = 124,261.70 × 80,571.51
4. Step 4: Simplify right side
   90,019.35x = 10,011,952,401.31
5. Step 5: Solve for x
   x = 10,011,952,401.31/90,019.35
6. Step 6: Final answer
   x = 111,220.00