Finding the Fourth Proportional to 31,369.89, 47,070.96 and 20,847.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,369.89 : 47,070.96 = 20,847.18 : x
2. Step 2: Convert to fraction form
   31,369.89/47,070.96 = 20,847.18/x
3. Step 3: Cross multiply
   31,369.89x = 47,070.96 × 20,847.18
4. Step 4: Simplify right side
   31,369.89x = 981,296,775.89
5. Step 5: Solve for x
   x = 981,296,775.89/31,369.89
6. Step 6: Final answer
   x = 31,281.49