Finding the Fourth Proportional to 7,899.81, 10,897.16 and 5,105.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,899.81 : 10,897.16 = 5,105.31 : x
2. Step 2: Convert to fraction form
   7,899.81/10,897.16 = 5,105.31/x
3. Step 3: Cross multiply
   7,899.81x = 10,897.16 × 5,105.31
4. Step 4: Simplify right side
   7,899.81x = 55,633,379.92
5. Step 5: Solve for x
   x = 55,633,379.92/7,899.81
6. Step 6: Final answer
   x = 7,042.37