Finding the Fourth Proportional to 2,072.72, 2,860.47 and 1,188.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.72 : 2,860.47 = 1,188.67 : x
2. Step 2: Convert to fraction form
   2,072.72/2,860.47 = 1,188.67/x
3. Step 3: Cross multiply
   2,072.72x = 2,860.47 × 1,188.67
4. Step 4: Simplify right side
   2,072.72x = 3,400,154.87
5. Step 5: Solve for x
   x = 3,400,154.87/2,072.72
6. Step 6: Final answer
   x = 1,640.43