Finding the Fourth Proportional to 9,956.66, 13,740.56 and 5,480.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,956.66 : 13,740.56 = 5,480.76 : x
2. Step 2: Convert to fraction form
   9,956.66/13,740.56 = 5,480.76/x
3. Step 3: Cross multiply
   9,956.66x = 13,740.56 × 5,480.76
4. Step 4: Simplify right side
   9,956.66x = 75,308,711.63
5. Step 5: Solve for x
   x = 75,308,711.63/9,956.66
6. Step 6: Final answer
   x = 7,563.65