Finding the Fourth Proportional to 10,991.79, 16,488.71 and 3,973.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.79 : 16,488.71 = 3,973.56 : x
2. Step 2: Convert to fraction form
   10,991.79/16,488.71 = 3,973.56/x
3. Step 3: Cross multiply
   10,991.79x = 16,488.71 × 3,973.56
4. Step 4: Simplify right side
   10,991.79x = 65,518,858.64
5. Step 5: Solve for x
   x = 65,518,858.64/10,991.79
6. Step 6: Final answer
   x = 5,960.71