Finding the Fourth Proportional to 11,638.88, 17,427.33 and 7,948.32

Step by Step Solution

1. Step 1: Write the proportion equation
   11,638.88 : 17,427.33 = 7,948.32 : x
2. Step 2: Convert to fraction form
   11,638.88/17,427.33 = 7,948.32/x
3. Step 3: Cross multiply
   11,638.88x = 17,427.33 × 7,948.32
4. Step 4: Simplify right side
   11,638.88x = 138,517,995.59
5. Step 5: Solve for x
   x = 138,517,995.59/11,638.88
6. Step 6: Final answer
   x = 11,901.32