Finding the Fourth Proportional to 9,858.72, 13,604.42 and 5,381.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,858.72 : 13,604.42 = 5,381.56 : x
2. Step 2: Convert to fraction form
   9,858.72/13,604.42 = 5,381.56/x
3. Step 3: Cross multiply
   9,858.72x = 13,604.42 × 5,381.56
4. Step 4: Simplify right side
   9,858.72x = 73,212,981.94
5. Step 5: Solve for x
   x = 73,212,981.94/9,858.72
6. Step 6: Final answer
   x = 7,426.22