Finding the Fourth Proportional to 1,215.45, 1,822.24 and 556.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.45 : 1,822.24 = 556.88 : x
2. Step 2: Convert to fraction form
   1,215.45/1,822.24 = 556.88/x
3. Step 3: Cross multiply
   1,215.45x = 1,822.24 × 556.88
4. Step 4: Simplify right side
   1,215.45x = 1,014,760.60
5. Step 5: Solve for x
   x = 1,014,760.60/1,215.45
6. Step 6: Final answer
   x = 834.88