Finding the Fourth Proportional to 9,670.56, 13,345.20 and 5,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,670.56 : 13,345.20 = 5,478.72 : x
2. Step 2: Convert to fraction form
   9,670.56/13,345.20 = 5,478.72/x
3. Step 3: Cross multiply
   9,670.56x = 13,345.20 × 5,478.72
4. Step 4: Simplify right side
   9,670.56x = 73,114,614.14
5. Step 5: Solve for x
   x = 73,114,614.14/9,670.56
6. Step 6: Final answer
   x = 7,560.54