Finding the Fourth Proportional to 9,858.74, 13,605.39 and 5,382.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,858.74 : 13,605.39 = 5,382.72 : x
2. Step 2: Convert to fraction form
   9,858.74/13,605.39 = 5,382.72/x
3. Step 3: Cross multiply
   9,858.74x = 13,605.39 × 5,382.72
4. Step 4: Simplify right side
   9,858.74x = 73,234,004.86
5. Step 5: Solve for x
   x = 73,234,004.86/9,858.74
6. Step 6: Final answer
   x = 7,428.34