Finding the Fourth Proportional to 10,137.12, 13,989.56 and 5,661.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,137.12 : 13,989.56 = 5,661.99 : x
2. Step 2: Convert to fraction form
   10,137.12/13,989.56 = 5,661.99/x
3. Step 3: Cross multiply
   10,137.12x = 13,989.56 × 5,661.99
4. Step 4: Simplify right side
   10,137.12x = 79,208,720.51
5. Step 5: Solve for x
   x = 79,208,720.51/10,137.12
6. Step 6: Final answer
   x = 7,813.73