Finding the Fourth Proportional to 9,290.81, 12,820.47 and 5,513.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.81 : 12,820.47 = 5,513.32 : x
2. Step 2: Convert to fraction form
   9,290.81/12,820.47 = 5,513.32/x
3. Step 3: Cross multiply
   9,290.81x = 12,820.47 × 5,513.32
4. Step 4: Simplify right side
   9,290.81x = 70,683,353.66
5. Step 5: Solve for x
   x = 70,683,353.66/9,290.81
6. Step 6: Final answer
   x = 7,607.88