Finding the Fourth Proportional to 1,057.86, 1,587.33 and 748.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.86 : 1,587.33 = 748.98 : x
2. Step 2: Convert to fraction form
   1,057.86/1,587.33 = 748.98/x
3. Step 3: Cross multiply
   1,057.86x = 1,587.33 × 748.98
4. Step 4: Simplify right side
   1,057.86x = 1,188,878.42
5. Step 5: Solve for x
   x = 1,188,878.42/1,057.86
6. Step 6: Final answer
   x = 1,123.85