Finding the Fourth Proportional to 10,215.85, 15,314.52 and 7,097.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.85 : 15,314.52 = 7,097.31 : x
2. Step 2: Convert to fraction form
   10,215.85/15,314.52 = 7,097.31/x
3. Step 3: Cross multiply
   10,215.85x = 15,314.52 × 7,097.31
4. Step 4: Simplify right side
   10,215.85x = 108,691,860.45
5. Step 5: Solve for x
   x = 108,691,860.45/10,215.85
6. Step 6: Final answer
   x = 10,639.54