Finding the Fourth Proportional to 9,857.60, 13,603.81 and 5,381.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,857.60 : 13,603.81 = 5,381.59 : x
2. Step 2: Convert to fraction form
   9,857.60/13,603.81 = 5,381.59/x
3. Step 3: Cross multiply
   9,857.60x = 13,603.81 × 5,381.59
4. Step 4: Simplify right side
   9,857.60x = 73,210,127.86
5. Step 5: Solve for x
   x = 73,210,127.86/9,857.60
6. Step 6: Final answer
   x = 7,426.77