Finding the Fourth Proportional to 10,215.35, 15,322.72 and 2,820.26

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.35 : 15,322.72 = 2,820.26 : x
2. Step 2: Convert to fraction form
   10,215.35/15,322.72 = 2,820.26/x
3. Step 3: Cross multiply
   10,215.35x = 15,322.72 × 2,820.26
4. Step 4: Simplify right side
   10,215.35x = 43,214,054.31
5. Step 5: Solve for x
   x = 43,214,054.31/10,215.35
6. Step 6: Final answer
   x = 4,230.31