Finding the Fourth Proportional to 12,444.21, 17,172.54 and 7,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,444.21 : 17,172.54 = 7,139.52 : x
2. Step 2: Convert to fraction form
   12,444.21/17,172.54 = 7,139.52/x
3. Step 3: Cross multiply
   12,444.21x = 17,172.54 × 7,139.52
4. Step 4: Simplify right side
   12,444.21x = 122,603,692.78
5. Step 5: Solve for x
   x = 122,603,692.78/12,444.21
6. Step 6: Final answer
   x = 9,852.27