Finding the Fourth Proportional to 9,776.57, 13,490.37 and 5,528.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,776.57 : 13,490.37 = 5,528.21 : x
2. Step 2: Convert to fraction form
   9,776.57/13,490.37 = 5,528.21/x
3. Step 3: Cross multiply
   9,776.57x = 13,490.37 × 5,528.21
4. Step 4: Simplify right side
   9,776.57x = 74,577,530.89
5. Step 5: Solve for x
   x = 74,577,530.89/9,776.57
6. Step 6: Final answer
   x = 7,628.19