Finding the Fourth Proportional to 9,947.21, 13,726.80 and 5,470.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,947.21 : 13,726.80 = 5,470.54 : x
2. Step 2: Convert to fraction form
   9,947.21/13,726.80 = 5,470.54/x
3. Step 3: Cross multiply
   9,947.21x = 13,726.80 × 5,470.54
4. Step 4: Simplify right side
   9,947.21x = 75,092,974.16
5. Step 5: Solve for x
   x = 75,092,974.16/9,947.21
6. Step 6: Final answer
   x = 7,549.15