Finding the Fourth Proportional to 21,271.31, 31,903.20 and 7,941.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,271.31 : 31,903.20 = 7,941.32 : x
2. Step 2: Convert to fraction form
   21,271.31/31,903.20 = 7,941.32/x
3. Step 3: Cross multiply
   21,271.31x = 31,903.20 × 7,941.32
4. Step 4: Simplify right side
   21,271.31x = 253,353,424.12
5. Step 5: Solve for x
   x = 253,353,424.12/21,271.31
6. Step 6: Final answer
   x = 11,910.57