Finding the Fourth Proportional to 10,215.57, 15,315.55 and 4,665.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.57 : 15,315.55 = 4,665.06 : x
2. Step 2: Convert to fraction form
   10,215.57/15,315.55 = 4,665.06/x
3. Step 3: Cross multiply
   10,215.57x = 15,315.55 × 4,665.06
4. Step 4: Simplify right side
   10,215.57x = 71,447,959.68
5. Step 5: Solve for x
   x = 71,447,959.68/10,215.57
6. Step 6: Final answer
   x = 6,994.03