Finding the Fourth Proportional to 10,401.12, 14,419.53 and 9,840.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,401.12 : 14,419.53 = 9,840.06 : x
2. Step 2: Convert to fraction form
   10,401.12/14,419.53 = 9,840.06/x
3. Step 3: Cross multiply
   10,401.12x = 14,419.53 × 9,840.06
4. Step 4: Simplify right side
   10,401.12x = 141,889,040.37
5. Step 5: Solve for x
   x = 141,889,040.37/10,401.12
6. Step 6: Final answer
   x = 13,641.71