Finding the Fourth Proportional to 9,988.72, 13,784.33 and 5,512.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.72 : 13,784.33 = 5,512.50 : x
2. Step 2: Convert to fraction form
   9,988.72/13,784.33 = 5,512.50/x
3. Step 3: Cross multiply
   9,988.72x = 13,784.33 × 5,512.50
4. Step 4: Simplify right side
   9,988.72x = 75,986,132.91
5. Step 5: Solve for x
   x = 75,986,132.91/9,988.72
6. Step 6: Final answer
   x = 7,607.20