Finding the Fourth Proportional to 9,865.51, 13,613.51 and 5,559.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,865.51 : 13,613.51 = 5,559.30 : x
2. Step 2: Convert to fraction form
   9,865.51/13,613.51 = 5,559.30/x
3. Step 3: Cross multiply
   9,865.51x = 13,613.51 × 5,559.30
4. Step 4: Simplify right side
   9,865.51x = 75,681,572.24
5. Step 5: Solve for x
   x = 75,681,572.24/9,865.51
6. Step 6: Final answer
   x = 7,671.33