Finding the Fourth Proportional to 9,291.86, 12,820.75 and 5,516.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,291.86 : 12,820.75 = 5,516.29 : x
2. Step 2: Convert to fraction form
   9,291.86/12,820.75 = 5,516.29/x
3. Step 3: Cross multiply
   9,291.86x = 12,820.75 × 5,516.29
4. Step 4: Simplify right side
   9,291.86x = 70,722,905.14
5. Step 5: Solve for x
   x = 70,722,905.14/9,291.86
6. Step 6: Final answer
   x = 7,611.27