Finding the Fourth Proportional to 2,113.35, 3,171.15 and 1,188.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.35 : 3,171.15 = 1,188.97 : x
2. Step 2: Convert to fraction form
   2,113.35/3,171.15 = 1,188.97/x
3. Step 3: Cross multiply
   2,113.35x = 3,171.15 × 1,188.97
4. Step 4: Simplify right side
   2,113.35x = 3,770,402.22
5. Step 5: Solve for x
   x = 3,770,402.22/2,113.35
6. Step 6: Final answer
   x = 1,784.09