Finding the Fourth Proportional to 9,128.37, 13,630.95 and 9,031.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.37 : 13,630.95 = 9,031.89 : x
2. Step 2: Convert to fraction form
   9,128.37/13,630.95 = 9,031.89/x
3. Step 3: Cross multiply
   9,128.37x = 13,630.95 × 9,031.89
4. Step 4: Simplify right side
   9,128.37x = 123,113,241.00
5. Step 5: Solve for x
   x = 123,113,241.00/9,128.37
6. Step 6: Final answer
   x = 13,486.88