Finding the Fourth Proportional to 3,934.98, 5,428.20 and 2,590.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.98 : 5,428.20 = 2,590.38 : x
2. Step 2: Convert to fraction form
   3,934.98/5,428.20 = 2,590.38/x
3. Step 3: Cross multiply
   3,934.98x = 5,428.20 × 2,590.38
4. Step 4: Simplify right side
   3,934.98x = 14,061,100.72
5. Step 5: Solve for x
   x = 14,061,100.72/3,934.98
6. Step 6: Final answer
   x = 3,573.36