Finding the Fourth Proportional to 1,385.82, 1,912.50 and 862.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.82 : 1,912.50 = 862.02 : x
2. Step 2: Convert to fraction form
   1,385.82/1,912.50 = 862.02/x
3. Step 3: Cross multiply
   1,385.82x = 1,912.50 × 862.02
4. Step 4: Simplify right side
   1,385.82x = 1,648,613.25
5. Step 5: Solve for x
   x = 1,648,613.25/1,385.82
6. Step 6: Final answer
   x = 1,189.63