Finding the Fourth Proportional to 31,942.01, 47,918.78 and 13,211.87

Step by Step Solution

1. Step 1: Write the proportion equation
   31,942.01 : 47,918.78 = 13,211.87 : x
2. Step 2: Convert to fraction form
   31,942.01/47,918.78 = 13,211.87/x
3. Step 3: Cross multiply
   31,942.01x = 47,918.78 × 13,211.87
4. Step 4: Simplify right side
   31,942.01x = 633,096,386.27
5. Step 5: Solve for x
   x = 633,096,386.27/31,942.01
6. Step 6: Final answer
   x = 19,820.18