Finding the Fourth Proportional to 1,431.49, 1,975.17 and 842.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.49 : 1,975.17 = 842.08 : x
2. Step 2: Convert to fraction form
   1,431.49/1,975.17 = 842.08/x
3. Step 3: Cross multiply
   1,431.49x = 1,975.17 × 842.08
4. Step 4: Simplify right side
   1,431.49x = 1,663,251.15
5. Step 5: Solve for x
   x = 1,663,251.15/1,431.49
6. Step 6: Final answer
   x = 1,161.90