Finding the Fourth Proportional to 1,530.05, 2,111.48 and 831.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.05 : 2,111.48 = 831.42 : x
2. Step 2: Convert to fraction form
   1,530.05/2,111.48 = 831.42/x
3. Step 3: Cross multiply
   1,530.05x = 2,111.48 × 831.42
4. Step 4: Simplify right side
   1,530.05x = 1,755,522.54
5. Step 5: Solve for x
   x = 1,755,522.54/1,530.05
6. Step 6: Final answer
   x = 1,147.37