Finding the Fourth Proportional to 71,131.49, 106,712.72 and 21,215.64

Step by Step Solution

1. Step 1: Write the proportion equation
   71,131.49 : 106,712.72 = 21,215.64 : x
2. Step 2: Convert to fraction form
   71,131.49/106,712.72 = 21,215.64/x
3. Step 3: Cross multiply
   71,131.49x = 106,712.72 × 21,215.64
4. Step 4: Simplify right side
   71,131.49x = 2,263,978,650.94
5. Step 5: Solve for x
   x = 2,263,978,650.94/71,131.49
6. Step 6: Final answer
   x = 31,828.08