Finding the Fourth Proportional to 1,038.52, 1,431.98 and 851.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.52 : 1,431.98 = 851.42 : x
2. Step 2: Convert to fraction form
   1,038.52/1,431.98 = 851.42/x
3. Step 3: Cross multiply
   1,038.52x = 1,431.98 × 851.42
4. Step 4: Simplify right side
   1,038.52x = 1,219,216.41
5. Step 5: Solve for x
   x = 1,219,216.41/1,038.52
6. Step 6: Final answer
   x = 1,173.99