Finding the Fourth Proportional to 9,858.09, 13,603.57 and 5,380.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,858.09 : 13,603.57 = 5,380.94 : x
2. Step 2: Convert to fraction form
   9,858.09/13,603.57 = 5,380.94/x
3. Step 3: Cross multiply
   9,858.09x = 13,603.57 × 5,380.94
4. Step 4: Simplify right side
   9,858.09x = 73,199,899.03
5. Step 5: Solve for x
   x = 73,199,899.03/9,858.09
6. Step 6: Final answer
   x = 7,425.36