Finding the Fourth Proportional to 6,636.72, 9,955.10 and 1,956.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,636.72 : 9,955.10 = 1,956.78 : x
2. Step 2: Convert to fraction form
   6,636.72/9,955.10 = 1,956.78/x
3. Step 3: Cross multiply
   6,636.72x = 9,955.10 × 1,956.78
4. Step 4: Simplify right side
   6,636.72x = 19,479,973.47
5. Step 5: Solve for x
   x = 19,479,973.47/6,636.72
6. Step 6: Final answer
   x = 2,935.18