Finding the Fourth Proportional to 9,388.08, 12,955.35 and 5,139.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,388.08 : 12,955.35 = 5,139.03 : x
2. Step 2: Convert to fraction form
   9,388.08/12,955.35 = 5,139.03/x
3. Step 3: Cross multiply
   9,388.08x = 12,955.35 × 5,139.03
4. Step 4: Simplify right side
   9,388.08x = 66,577,932.31
5. Step 5: Solve for x
   x = 66,577,932.31/9,388.08
6. Step 6: Final answer
   x = 7,091.75