Finding the Fourth Proportional to 7,111.92, 10,668.45 and 1,917.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.92 : 10,668.45 = 1,917.72 : x
2. Step 2: Convert to fraction form
   7,111.92/10,668.45 = 1,917.72/x
3. Step 3: Cross multiply
   7,111.92x = 10,668.45 × 1,917.72
4. Step 4: Simplify right side
   7,111.92x = 20,459,099.93
5. Step 5: Solve for x
   x = 20,459,099.93/7,111.92
6. Step 6: Final answer
   x = 2,876.73