Finding the Fourth Proportional to 1,431.60, 1,976.04 and 841.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.60 : 1,976.04 = 841.92 : x
2. Step 2: Convert to fraction form
   1,431.60/1,976.04 = 841.92/x
3. Step 3: Cross multiply
   1,431.60x = 1,976.04 × 841.92
4. Step 4: Simplify right side
   1,431.60x = 1,663,667.60
5. Step 5: Solve for x
   x = 1,663,667.60/1,431.60
6. Step 6: Final answer
   x = 1,162.10