Finding the Fourth Proportional to 9,572.78, 13,210.56 and 5,381

Step by Step Solution

1. Step 1: Write the proportion equation
   9,572.78 : 13,210.56 = 5,381 : x
2. Step 2: Convert to fraction form
   9,572.78/13,210.56 = 5,381/x
3. Step 3: Cross multiply
   9,572.78x = 13,210.56 × 5,381
4. Step 4: Simplify right side
   9,572.78x = 71,086,023.36
5. Step 5: Solve for x
   x = 71,086,023.36/9,572.78
6. Step 6: Final answer
   x = 7,425.85