Finding the Fourth Proportional to 107,978.40, 149,010.09 and 60,231.72

Step by Step Solution

1. Step 1: Write the proportion equation
   107,978.40 : 149,010.09 = 60,231.72 : x
2. Step 2: Convert to fraction form
   107,978.40/149,010.09 = 60,231.72/x
3. Step 3: Cross multiply
   107,978.40x = 149,010.09 × 60,231.72
4. Step 4: Simplify right side
   107,978.40x = 8,975,134,018.05
5. Step 5: Solve for x
   x = 8,975,134,018.05/107,978.40
6. Step 6: Final answer
   x = 83,119.72