Finding the Fourth Proportional to 9,521.08, 13,139.23 and 5,485.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.08 : 13,139.23 = 5,485.68 : x
2. Step 2: Convert to fraction form
   9,521.08/13,139.23 = 5,485.68/x
3. Step 3: Cross multiply
   9,521.08x = 13,139.23 × 5,485.68
4. Step 4: Simplify right side
   9,521.08x = 72,077,604.37
5. Step 5: Solve for x
   x = 72,077,604.37/9,521.08
6. Step 6: Final answer
   x = 7,570.32