Finding the Fourth Proportional to 1,051.18, 1,575.78 and 557.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.18 : 1,575.78 = 557.49 : x
2. Step 2: Convert to fraction form
   1,051.18/1,575.78 = 557.49/x
3. Step 3: Cross multiply
   1,051.18x = 1,575.78 × 557.49
4. Step 4: Simplify right side
   1,051.18x = 878,481.59
5. Step 5: Solve for x
   x = 878,481.59/1,051.18
6. Step 6: Final answer
   x = 835.71