Finding the Fourth Proportional to 2,072.55, 2,860.17 and 1,188.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.55 : 2,860.17 = 1,188.30 : x
2. Step 2: Convert to fraction form
   2,072.55/2,860.17 = 1,188.30/x
3. Step 3: Cross multiply
   2,072.55x = 2,860.17 × 1,188.30
4. Step 4: Simplify right side
   2,072.55x = 3,398,740.01
5. Step 5: Solve for x
   x = 3,398,740.01/2,072.55
6. Step 6: Final answer
   x = 1,639.88