Finding the Fourth Proportional to 1,530.09, 2,111.47 and 831.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.09 : 2,111.47 = 831.46 : x
2. Step 2: Convert to fraction form
   1,530.09/2,111.47 = 831.46/x
3. Step 3: Cross multiply
   1,530.09x = 2,111.47 × 831.46
4. Step 4: Simplify right side
   1,530.09x = 1,755,602.85
5. Step 5: Solve for x
   x = 1,755,602.85/1,530.09
6. Step 6: Final answer
   x = 1,147.39