Finding the Fourth Proportional to 1,530.17, 2,111.62 and 831.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.17 : 2,111.62 = 831.54 : x
2. Step 2: Convert to fraction form
   1,530.17/2,111.62 = 831.54/x
3. Step 3: Cross multiply
   1,530.17x = 2,111.62 × 831.54
4. Step 4: Simplify right side
   1,530.17x = 1,755,902.81
5. Step 5: Solve for x
   x = 1,755,902.81/1,530.17
6. Step 6: Final answer
   x = 1,147.52