Finding the Fourth Proportional to 21,278.56, 31,932.42 and 7,427.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,278.56 : 31,932.42 = 7,427.56 : x
2. Step 2: Convert to fraction form
   21,278.56/31,932.42 = 7,427.56/x
3. Step 3: Cross multiply
   21,278.56x = 31,932.42 × 7,427.56
4. Step 4: Simplify right side
   21,278.56x = 237,179,965.50
5. Step 5: Solve for x
   x = 237,179,965.50/21,278.56
6. Step 6: Final answer
   x = 11,146.43