Finding the Fourth Proportional to 1,386.42, 2,086.62 and 1,041.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.42 : 2,086.62 = 1,041.57 : x
2. Step 2: Convert to fraction form
   1,386.42/2,086.62 = 1,041.57/x
3. Step 3: Cross multiply
   1,386.42x = 2,086.62 × 1,041.57
4. Step 4: Simplify right side
   1,386.42x = 2,173,360.79
5. Step 5: Solve for x
   x = 2,173,360.79/1,386.42
6. Step 6: Final answer
   x = 1,567.61