Finding the Fourth Proportional to 2,113.74, 3,171.82 and 1,139.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.74 : 3,171.82 = 1,139.82 : x
2. Step 2: Convert to fraction form
   2,113.74/3,171.82 = 1,139.82/x
3. Step 3: Cross multiply
   2,113.74x = 3,171.82 × 1,139.82
4. Step 4: Simplify right side
   2,113.74x = 3,615,303.87
5. Step 5: Solve for x
   x = 3,615,303.87/2,113.74
6. Step 6: Final answer
   x = 1,710.38