Finding the Fourth Proportional to 3,490.89, 5,239.75 and 2,602.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,490.89 : 5,239.75 = 2,602.42 : x
2. Step 2: Convert to fraction form
   3,490.89/5,239.75 = 2,602.42/x
3. Step 3: Cross multiply
   3,490.89x = 5,239.75 × 2,602.42
4. Step 4: Simplify right side
   3,490.89x = 13,636,010.59
5. Step 5: Solve for x
   x = 13,636,010.59/3,490.89
6. Step 6: Final answer
   x = 3,906.17