Finding the Fourth Proportional to 9,290.88, 12,820.74 and 5,513.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.88 : 12,820.74 = 5,513.88 : x
2. Step 2: Convert to fraction form
   9,290.88/12,820.74 = 5,513.88/x
3. Step 3: Cross multiply
   9,290.88x = 12,820.74 × 5,513.88
4. Step 4: Simplify right side
   9,290.88x = 70,692,021.87
5. Step 5: Solve for x
   x = 70,692,021.87/9,290.88
6. Step 6: Final answer
   x = 7,608.75