Finding the Fourth Proportional to 1,431.52, 1,975.20 and 841.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.52 : 1,975.20 = 841.92 : x
2. Step 2: Convert to fraction form
   1,431.52/1,975.20 = 841.92/x
3. Step 3: Cross multiply
   1,431.52x = 1,975.20 × 841.92
4. Step 4: Simplify right side
   1,431.52x = 1,662,960.38
5. Step 5: Solve for x
   x = 1,662,960.38/1,431.52
6. Step 6: Final answer
   x = 1,161.67