Finding the Fourth Proportional to 9,777.45, 13,489.70 and 5,528.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,777.45 : 13,489.70 = 5,528.10 : x
2. Step 2: Convert to fraction form
   9,777.45/13,489.70 = 5,528.10/x
3. Step 3: Cross multiply
   9,777.45x = 13,489.70 × 5,528.10
4. Step 4: Simplify right side
   9,777.45x = 74,572,410.57
5. Step 5: Solve for x
   x = 74,572,410.57/9,777.45
6. Step 6: Final answer
   x = 7,626.98