Finding the Fourth Proportional to 10,137.50, 13,991.15 and 5,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,137.50 : 13,991.15 = 5,661.50 : x
2. Step 2: Convert to fraction form
   10,137.50/13,991.15 = 5,661.50/x
3. Step 3: Cross multiply
   10,137.50x = 13,991.15 × 5,661.50
4. Step 4: Simplify right side
   10,137.50x = 79,210,944.86
5. Step 5: Solve for x
   x = 79,210,944.86/10,137.50
6. Step 6: Final answer
   x = 7,813.66