Finding the Fourth Proportional to 81,018.63, 121,231.89 and 49,313.07

Step by Step Solution

1. Step 1: Write the proportion equation
   81,018.63 : 121,231.89 = 49,313.07 : x
2. Step 2: Convert to fraction form
   81,018.63/121,231.89 = 49,313.07/x
3. Step 3: Cross multiply
   81,018.63x = 121,231.89 × 49,313.07
4. Step 4: Simplify right side
   81,018.63x = 5,978,316,677.80
5. Step 5: Solve for x
   x = 5,978,316,677.80/81,018.63
6. Step 6: Final answer
   x = 73,789.41