Finding the Fourth Proportional to 2,071.72, 2,859.09 and 1,187.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.72 : 2,859.09 = 1,187.67 : x
2. Step 2: Convert to fraction form
   2,071.72/2,859.09 = 1,187.67/x
3. Step 3: Cross multiply
   2,071.72x = 2,859.09 × 1,187.67
4. Step 4: Simplify right side
   2,071.72x = 3,395,655.42
5. Step 5: Solve for x
   x = 3,395,655.42/2,071.72
6. Step 6: Final answer
   x = 1,639.05