Finding the Fourth Proportional to 9,294.30, 13,928.88 and 5,128.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,294.30 : 13,928.88 = 5,128.06 : x
2. Step 2: Convert to fraction form
   9,294.30/13,928.88 = 5,128.06/x
3. Step 3: Cross multiply
   9,294.30x = 13,928.88 × 5,128.06
4. Step 4: Simplify right side
   9,294.30x = 71,428,132.37
5. Step 5: Solve for x
   x = 71,428,132.37/9,294.30
6. Step 6: Final answer
   x = 7,685.15