Finding the Fourth Proportional to 2,123.87, 3,186.71 and 1,511.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.87 : 3,186.71 = 1,511.51 : x
2. Step 2: Convert to fraction form
   2,123.87/3,186.71 = 1,511.51/x
3. Step 3: Cross multiply
   2,123.87x = 3,186.71 × 1,511.51
4. Step 4: Simplify right side
   2,123.87x = 4,816,744.03
5. Step 5: Solve for x
   x = 4,816,744.03/2,123.87
6. Step 6: Final answer
   x = 2,267.91