Finding the Fourth Proportional to 9,947.03, 13,726.79 and 7,406.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,947.03 : 13,726.79 = 7,406.15 : x
2. Step 2: Convert to fraction form
   9,947.03/13,726.79 = 7,406.15/x
3. Step 3: Cross multiply
   9,947.03x = 13,726.79 × 7,406.15
4. Step 4: Simplify right side
   9,947.03x = 101,662,665.76
5. Step 5: Solve for x
   x = 101,662,665.76/9,947.03
6. Step 6: Final answer
   x = 10,220.40