Finding the Fourth Proportional to 1,036.02, 1,431.09 and 987.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.02 : 1,431.09 = 987.42 : x
2. Step 2: Convert to fraction form
   1,036.02/1,431.09 = 987.42/x
3. Step 3: Cross multiply
   1,036.02x = 1,431.09 × 987.42
4. Step 4: Simplify right side
   1,036.02x = 1,413,086.89
5. Step 5: Solve for x
   x = 1,413,086.89/1,036.02
6. Step 6: Final answer
   x = 1,363.96