Finding the Fourth Proportional to 10,136.50, 13,988.37 and 5,720.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,136.50 : 13,988.37 = 5,720.50 : x
2. Step 2: Convert to fraction form
   10,136.50/13,988.37 = 5,720.50/x
3. Step 3: Cross multiply
   10,136.50x = 13,988.37 × 5,720.50
4. Step 4: Simplify right side
   10,136.50x = 80,020,470.59
5. Step 5: Solve for x
   x = 80,020,470.59/10,136.50
6. Step 6: Final answer
   x = 7,894.29