Finding the Fourth Proportional to 1,530.10, 2,111.55 and 831.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.10 : 2,111.55 = 831.49 : x
2. Step 2: Convert to fraction form
   1,530.10/2,111.55 = 831.49/x
3. Step 3: Cross multiply
   1,530.10x = 2,111.55 × 831.49
4. Step 4: Simplify right side
   1,530.10x = 1,755,732.71
5. Step 5: Solve for x
   x = 1,755,732.71/1,530.10
6. Step 6: Final answer
   x = 1,147.46