Finding the Fourth Proportional to 10,439.09, 14,389.58 and 7,911.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,439.09 : 14,389.58 = 7,911.08 : x
2. Step 2: Convert to fraction form
   10,439.09/14,389.58 = 7,911.08/x
3. Step 3: Cross multiply
   10,439.09x = 14,389.58 × 7,911.08
4. Step 4: Simplify right side
   10,439.09x = 113,837,118.55
5. Step 5: Solve for x
   x = 113,837,118.55/10,439.09
6. Step 6: Final answer
   x = 10,904.89