Finding the Fourth Proportional to 10,991.21, 16,477.56 and 3,591.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.21 : 16,477.56 = 3,591.63 : x
2. Step 2: Convert to fraction form
   10,991.21/16,477.56 = 3,591.63/x
3. Step 3: Cross multiply
   10,991.21x = 16,477.56 × 3,591.63
4. Step 4: Simplify right side
   10,991.21x = 59,181,298.82
5. Step 5: Solve for x
   x = 59,181,298.82/10,991.21
6. Step 6: Final answer
   x = 5,384.42