Finding the Fourth Proportional to 10,858.05, 14,978.25 and 7,315.11

Step by Step Solution

1. Step 1: Write the proportion equation
   10,858.05 : 14,978.25 = 7,315.11 : x
2. Step 2: Convert to fraction form
   10,858.05/14,978.25 = 7,315.11/x
3. Step 3: Cross multiply
   10,858.05x = 14,978.25 × 7,315.11
4. Step 4: Simplify right side
   10,858.05x = 109,567,546.36
5. Step 5: Solve for x
   x = 109,567,546.36/10,858.05
6. Step 6: Final answer
   x = 10,090.90