Finding the Fourth Proportional to 5,245.89, 7,239.33 and 2,887.98

Step by Step Solution

1. Step 1: Write the proportion equation
   5,245.89 : 7,239.33 = 2,887.98 : x
2. Step 2: Convert to fraction form
   5,245.89/7,239.33 = 2,887.98/x
3. Step 3: Cross multiply
   5,245.89x = 7,239.33 × 2,887.98
4. Step 4: Simplify right side
   5,245.89x = 20,907,040.25
5. Step 5: Solve for x
   x = 20,907,040.25/5,245.89
6. Step 6: Final answer
   x = 3,985.41