Finding the Fourth Proportional to 31,431.98, 47,054.34 and 20,306.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,431.98 : 47,054.34 = 20,306.18 : x
2. Step 2: Convert to fraction form
   31,431.98/47,054.34 = 20,306.18/x
3. Step 3: Cross multiply
   31,431.98x = 47,054.34 × 20,306.18
4. Step 4: Simplify right side
   31,431.98x = 955,493,897.82
5. Step 5: Solve for x
   x = 955,493,897.82/31,431.98
6. Step 6: Final answer
   x = 30,398.78