Finding the Fourth Proportional to 9,857.56, 13,603.75 and 5,381.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,857.56 : 13,603.75 = 5,381.55 : x
2. Step 2: Convert to fraction form
   9,857.56/13,603.75 = 5,381.55/x
3. Step 3: Cross multiply
   9,857.56x = 13,603.75 × 5,381.55
4. Step 4: Simplify right side
   9,857.56x = 73,209,165.89
5. Step 5: Solve for x
   x = 73,209,165.89/9,857.56
6. Step 6: Final answer
   x = 7,426.71