Finding the Fourth Proportional to 3,139.67, 4,711.87 and 1,167.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.67 : 4,711.87 = 1,167.12 : x
2. Step 2: Convert to fraction form
   3,139.67/4,711.87 = 1,167.12/x
3. Step 3: Cross multiply
   3,139.67x = 4,711.87 × 1,167.12
4. Step 4: Simplify right side
   3,139.67x = 5,499,317.71
5. Step 5: Solve for x
   x = 5,499,317.71/3,139.67
6. Step 6: Final answer
   x = 1,751.56