Finding the Fourth Proportional to 9,109.47, 12,570.44 and 5,382.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.47 : 12,570.44 = 5,382.75 : x
2. Step 2: Convert to fraction form
   9,109.47/12,570.44 = 5,382.75/x
3. Step 3: Cross multiply
   9,109.47x = 12,570.44 × 5,382.75
4. Step 4: Simplify right side
   9,109.47x = 67,663,509.00
5. Step 5: Solve for x
   x = 67,663,509.00/9,109.47
6. Step 6: Final answer
   x = 7,427.82