Finding the Fourth Proportional to 120,731.98, 181,105.21 and 31,985.23

Step by Step Solution

1. Step 1: Write the proportion equation
   120,731.98 : 181,105.21 = 31,985.23 : x
2. Step 2: Convert to fraction form
   120,731.98/181,105.21 = 31,985.23/x
3. Step 3: Cross multiply
   120,731.98x = 181,105.21 × 31,985.23
4. Step 4: Simplify right side
   120,731.98x = 5,792,692,128.87
5. Step 5: Solve for x
   x = 5,792,692,128.87/120,731.98
6. Step 6: Final answer
   x = 47,979.76