Finding the Fourth Proportional to 21,298.56, 31,947.57 and 7,254.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,298.56 : 31,947.57 = 7,254.78 : x
2. Step 2: Convert to fraction form
   21,298.56/31,947.57 = 7,254.78/x
3. Step 3: Cross multiply
   21,298.56x = 31,947.57 × 7,254.78
4. Step 4: Simplify right side
   21,298.56x = 231,772,591.88
5. Step 5: Solve for x
   x = 231,772,591.88/21,298.56
6. Step 6: Final answer
   x = 10,882.08