Finding the Fourth Proportional to 9,039.20, 13,561.56 and 3,116.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,039.20 : 13,561.56 = 3,116.21 : x
2. Step 2: Convert to fraction form
   9,039.20/13,561.56 = 3,116.21/x
3. Step 3: Cross multiply
   9,039.20x = 13,561.56 × 3,116.21
4. Step 4: Simplify right side
   9,039.20x = 42,260,601.08
5. Step 5: Solve for x
   x = 42,260,601.08/9,039.20
6. Step 6: Final answer
   x = 4,675.26