Finding the Fourth Proportional to 1,128.42, 1,693.08 and 580.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.42 : 1,693.08 = 580.86 : x
2. Step 2: Convert to fraction form
   1,128.42/1,693.08 = 580.86/x
3. Step 3: Cross multiply
   1,128.42x = 1,693.08 × 580.86
4. Step 4: Simplify right side
   1,128.42x = 983,442.45
5. Step 5: Solve for x
   x = 983,442.45/1,128.42
6. Step 6: Final answer
   x = 871.52