Finding the Fourth Proportional to 9,559.60, 13,214.28 and 7,978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,559.60 : 13,214.28 = 7,978.48 : x
2. Step 2: Convert to fraction form
   9,559.60/13,214.28 = 7,978.48/x
3. Step 3: Cross multiply
   9,559.60x = 13,214.28 × 7,978.48
4. Step 4: Simplify right side
   9,559.60x = 105,429,868.69
5. Step 5: Solve for x
   x = 105,429,868.69/9,559.60
6. Step 6: Final answer
   x = 11,028.69