Finding the Fourth Proportional to 7,842.72, 10,811.52 and 5,600.64

Step by Step Solution

1. Step 1: Write the proportion equation
   7,842.72 : 10,811.52 = 5,600.64 : x
2. Step 2: Convert to fraction form
   7,842.72/10,811.52 = 5,600.64/x
3. Step 3: Cross multiply
   7,842.72x = 10,811.52 × 5,600.64
4. Step 4: Simplify right side
   7,842.72x = 60,551,431.37
5. Step 5: Solve for x
   x = 60,551,431.37/7,842.72
6. Step 6: Final answer
   x = 7,720.72