Finding the Fourth Proportional to 5,245.48, 7,238.71 and 2,887.57

Step by Step Solution

1. Step 1: Write the proportion equation
   5,245.48 : 7,238.71 = 2,887.57 : x
2. Step 2: Convert to fraction form
   5,245.48/7,238.71 = 2,887.57/x
3. Step 3: Cross multiply
   5,245.48x = 7,238.71 × 2,887.57
4. Step 4: Simplify right side
   5,245.48x = 20,902,281.83
5. Step 5: Solve for x
   x = 20,902,281.83/5,245.48
6. Step 6: Final answer
   x = 3,984.82