Finding the Fourth Proportional to 2,719.89, 4,072.47 and 2,131.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.89 : 4,072.47 = 2,131.80 : x
2. Step 2: Convert to fraction form
   2,719.89/4,072.47 = 2,131.80/x
3. Step 3: Cross multiply
   2,719.89x = 4,072.47 × 2,131.80
4. Step 4: Simplify right side
   2,719.89x = 8,681,691.55
5. Step 5: Solve for x
   x = 8,681,691.55/2,719.89
6. Step 6: Final answer
   x = 3,191.93