Finding the Fourth Proportional to 31,426.13, 47,139.42 and 9,239.82

Step by Step Solution

1. Step 1: Write the proportion equation
   31,426.13 : 47,139.42 = 9,239.82 : x
2. Step 2: Convert to fraction form
   31,426.13/47,139.42 = 9,239.82/x
3. Step 3: Cross multiply
   31,426.13x = 47,139.42 × 9,239.82
4. Step 4: Simplify right side
   31,426.13x = 435,559,826.77
5. Step 5: Solve for x
   x = 435,559,826.77/31,426.13
6. Step 6: Final answer
   x = 13,859.80