Finding the Fourth Proportional to 5,290.01, 7,917.85 and 3,902.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,290.01 : 7,917.85 = 3,902.78 : x
2. Step 2: Convert to fraction form
   5,290.01/7,917.85 = 3,902.78/x
3. Step 3: Cross multiply
   5,290.01x = 7,917.85 × 3,902.78
4. Step 4: Simplify right side
   5,290.01x = 30,901,651.30
5. Step 5: Solve for x
   x = 30,901,651.30/5,290.01
6. Step 6: Final answer
   x = 5,841.51