Finding the Fourth Proportional to 1,142.30, 1,575.50 and 862.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.30 : 1,575.50 = 862.58 : x
2. Step 2: Convert to fraction form
   1,142.30/1,575.50 = 862.58/x
3. Step 3: Cross multiply
   1,142.30x = 1,575.50 × 862.58
4. Step 4: Simplify right side
   1,142.30x = 1,358,982.60
5. Step 5: Solve for x
   x = 1,358,982.60/1,142.30
6. Step 6: Final answer
   x = 1,189.69