Finding the Fourth Proportional to 10,459.12, 14,412.31 and 9,720.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,459.12 : 14,412.31 = 9,720.94 : x
2. Step 2: Convert to fraction form
   10,459.12/14,412.31 = 9,720.94/x
3. Step 3: Cross multiply
   10,459.12x = 14,412.31 × 9,720.94
4. Step 4: Simplify right side
   10,459.12x = 140,101,200.77
5. Step 5: Solve for x
   x = 140,101,200.77/10,459.12
6. Step 6: Final answer
   x = 13,395.12