Finding the Fourth Proportional to 1,215.89, 1,824.38 and 557.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.89 : 1,824.38 = 557.96 : x
2. Step 2: Convert to fraction form
   1,215.89/1,824.38 = 557.96/x
3. Step 3: Cross multiply
   1,215.89x = 1,824.38 × 557.96
4. Step 4: Simplify right side
   1,215.89x = 1,017,919.15
5. Step 5: Solve for x
   x = 1,017,919.15/1,215.89
6. Step 6: Final answer
   x = 837.18