Finding the Fourth Proportional to 12,820.12, 17,692.38 and 7,231

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.12 : 17,692.38 = 7,231 : x
2. Step 2: Convert to fraction form
   12,820.12/17,692.38 = 7,231/x
3. Step 3: Cross multiply
   12,820.12x = 17,692.38 × 7,231
4. Step 4: Simplify right side
   12,820.12x = 127,933,599.78
5. Step 5: Solve for x
   x = 127,933,599.78/12,820.12
6. Step 6: Final answer
   x = 9,979.13