Finding the Fourth Proportional to 9,145.92, 12,621.60 and 5,611.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.92 : 12,621.60 = 5,611.08 : x
2. Step 2: Convert to fraction form
   9,145.92/12,621.60 = 5,611.08/x
3. Step 3: Cross multiply
   9,145.92x = 12,621.60 × 5,611.08
4. Step 4: Simplify right side
   9,145.92x = 70,820,807.33
5. Step 5: Solve for x
   x = 70,820,807.33/9,145.92
6. Step 6: Final answer
   x = 7,743.43