Finding the Fourth Proportional to 120,971.31, 181,486.74 and 42,086.22

Step by Step Solution

1. Step 1: Write the proportion equation
   120,971.31 : 181,486.74 = 42,086.22 : x
2. Step 2: Convert to fraction form
   120,971.31/181,486.74 = 42,086.22/x
3. Step 3: Cross multiply
   120,971.31x = 181,486.74 × 42,086.22
4. Step 4: Simplify right side
   120,971.31x = 7,638,090,866.72
5. Step 5: Solve for x
   x = 7,638,090,866.72/120,971.31
6. Step 6: Final answer
   x = 63,139.69