Finding the Fourth Proportional to 10,390.21, 14,338.42 and 6,411.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,390.21 : 14,338.42 = 6,411.31 : x
2. Step 2: Convert to fraction form
   10,390.21/14,338.42 = 6,411.31/x
3. Step 3: Cross multiply
   10,390.21x = 14,338.42 × 6,411.31
4. Step 4: Simplify right side
   10,390.21x = 91,928,055.53
5. Step 5: Solve for x
   x = 91,928,055.53/10,390.21
6. Step 6: Final answer
   x = 8,847.56