Finding the Fourth Proportional to 2,072.42, 2,860.43 and 1,188.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.42 : 2,860.43 = 1,188.21 : x
2. Step 2: Convert to fraction form
   2,072.42/2,860.43 = 1,188.21/x
3. Step 3: Cross multiply
   2,072.42x = 2,860.43 × 1,188.21
4. Step 4: Simplify right side
   2,072.42x = 3,398,791.53
5. Step 5: Solve for x
   x = 3,398,791.53/2,072.42
6. Step 6: Final answer
   x = 1,640.01