Finding the Fourth Proportional to 10,308.72, 15,443.64 and 7,988.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,308.72 : 15,443.64 = 7,988.88 : x
2. Step 2: Convert to fraction form
   10,308.72/15,443.64 = 7,988.88/x
3. Step 3: Cross multiply
   10,308.72x = 15,443.64 × 7,988.88
4. Step 4: Simplify right side
   10,308.72x = 123,377,386.72
5. Step 5: Solve for x
   x = 123,377,386.72/10,308.72
6. Step 6: Final answer
   x = 11,968.25