Finding the Fourth Proportional to 8,991.78, 13,488.59 and 3,449.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,991.78 : 13,488.59 = 3,449.76 : x
2. Step 2: Convert to fraction form
   8,991.78/13,488.59 = 3,449.76/x
3. Step 3: Cross multiply
   8,991.78x = 13,488.59 × 3,449.76
4. Step 4: Simplify right side
   8,991.78x = 46,532,356.28
5. Step 5: Solve for x
   x = 46,532,356.28/8,991.78
6. Step 6: Final answer
   x = 5,174.99