Finding the Fourth Proportional to 11,769.68, 17,656.84 and 3,980.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,769.68 : 17,656.84 = 3,980.72 : x
2. Step 2: Convert to fraction form
   11,769.68/17,656.84 = 3,980.72/x
3. Step 3: Cross multiply
   11,769.68x = 17,656.84 × 3,980.72
4. Step 4: Simplify right side
   11,769.68x = 70,286,936.12
5. Step 5: Solve for x
   x = 70,286,936.12/11,769.68
6. Step 6: Final answer
   x = 5,971.86