Finding the Fourth Proportional to 1,431.73, 1,975.98 and 842.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.73 : 1,975.98 = 842.50 : x
2. Step 2: Convert to fraction form
   1,431.73/1,975.98 = 842.50/x
3. Step 3: Cross multiply
   1,431.73x = 1,975.98 × 842.50
4. Step 4: Simplify right side
   1,431.73x = 1,664,763.15
5. Step 5: Solve for x
   x = 1,664,763.15/1,431.73
6. Step 6: Final answer
   x = 1,162.76