Finding the Fourth Proportional to 5,300.78, 7,952.18 and 2,138.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,300.78 : 7,952.18 = 2,138.47 : x
2. Step 2: Convert to fraction form
   5,300.78/7,952.18 = 2,138.47/x
3. Step 3: Cross multiply
   5,300.78x = 7,952.18 × 2,138.47
4. Step 4: Simplify right side
   5,300.78x = 17,005,498.36
5. Step 5: Solve for x
   x = 17,005,498.36/5,300.78
6. Step 6: Final answer
   x = 3,208.11