Finding the Fourth Proportional to 9,858.17, 13,604.42 and 5,381.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,858.17 : 13,604.42 = 5,381.91 : x
2. Step 2: Convert to fraction form
   9,858.17/13,604.42 = 5,381.91/x
3. Step 3: Cross multiply
   9,858.17x = 13,604.42 × 5,381.91
4. Step 4: Simplify right side
   9,858.17x = 73,217,777.50
5. Step 5: Solve for x
   x = 73,217,777.50/9,858.17
6. Step 6: Final answer
   x = 7,427.11