Finding the Fourth Proportional to 1,288.74, 1,933.56 and 557.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.74 : 1,933.56 = 557.94 : x
2. Step 2: Convert to fraction form
   1,288.74/1,933.56 = 557.94/x
3. Step 3: Cross multiply
   1,288.74x = 1,933.56 × 557.94
4. Step 4: Simplify right side
   1,288.74x = 1,078,810.47
5. Step 5: Solve for x
   x = 1,078,810.47/1,288.74
6. Step 6: Final answer
   x = 837.10