Finding the Fourth Proportional to 1,036.72, 1,564 and 985.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.72 : 1,564 = 985.42 : x
2. Step 2: Convert to fraction form
   1,036.72/1,564 = 985.42/x
3. Step 3: Cross multiply
   1,036.72x = 1,564 × 985.42
4. Step 4: Simplify right side
   1,036.72x = 1,541,196.88
5. Step 5: Solve for x
   x = 1,541,196.88/1,036.72
6. Step 6: Final answer
   x = 1,486.61