Finding the Fourth Proportional to 11,766.51, 17,653.01 and 3,980.79

Step by Step Solution

1. Step 1: Write the proportion equation
   11,766.51 : 17,653.01 = 3,980.79 : x
2. Step 2: Convert to fraction form
   11,766.51/17,653.01 = 3,980.79/x
3. Step 3: Cross multiply
   11,766.51x = 17,653.01 × 3,980.79
4. Step 4: Simplify right side
   11,766.51x = 70,272,905.77
5. Step 5: Solve for x
   x = 70,272,905.77/11,766.51
6. Step 6: Final answer
   x = 5,972.28