Finding the Fourth Proportional to 5,242.61, 7,860.52 and 2,778.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,242.61 : 7,860.52 = 2,778.59 : x
2. Step 2: Convert to fraction form
   5,242.61/7,860.52 = 2,778.59/x
3. Step 3: Cross multiply
   5,242.61x = 7,860.52 × 2,778.59
4. Step 4: Simplify right side
   5,242.61x = 21,841,162.27
5. Step 5: Solve for x
   x = 21,841,162.27/5,242.61
6. Step 6: Final answer
   x = 4,166.09