Finding the Fourth Proportional to 2,111.67, 2,913.57 and 1,861.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.67 : 2,913.57 = 1,861.38 : x
2. Step 2: Convert to fraction form
   2,111.67/2,913.57 = 1,861.38/x
3. Step 3: Cross multiply
   2,111.67x = 2,913.57 × 1,861.38
4. Step 4: Simplify right side
   2,111.67x = 5,423,260.93
5. Step 5: Solve for x
   x = 5,423,260.93/2,111.67
6. Step 6: Final answer
   x = 2,568.23