Finding the Fourth Proportional to 9,513.75, 13,125.78 and 5,531.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,513.75 : 13,125.78 = 5,531.59 : x
2. Step 2: Convert to fraction form
   9,513.75/13,125.78 = 5,531.59/x
3. Step 3: Cross multiply
   9,513.75x = 13,125.78 × 5,531.59
4. Step 4: Simplify right side
   9,513.75x = 72,606,449.80
5. Step 5: Solve for x
   x = 72,606,449.80/9,513.75
6. Step 6: Final answer
   x = 7,631.74