Finding the Fourth Proportional to 2,123.59, 2,930.92 and 1,587.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.59 : 2,930.92 = 1,587.91 : x
2. Step 2: Convert to fraction form
   2,123.59/2,930.92 = 1,587.91/x
3. Step 3: Cross multiply
   2,123.59x = 2,930.92 × 1,587.91
4. Step 4: Simplify right side
   2,123.59x = 4,654,045.16
5. Step 5: Solve for x
   x = 4,654,045.16/2,123.59
6. Step 6: Final answer
   x = 2,191.60