Finding the Fourth Proportional to 9,357.92, 12,913.60 and 5,631.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,357.92 : 12,913.60 = 5,631.20 : x
2. Step 2: Convert to fraction form
   9,357.92/12,913.60 = 5,631.20/x
3. Step 3: Cross multiply
   9,357.92x = 12,913.60 × 5,631.20
4. Step 4: Simplify right side
   9,357.92x = 72,719,064.32
5. Step 5: Solve for x
   x = 72,719,064.32/9,357.92
6. Step 6: Final answer
   x = 7,770.86