Finding the Fourth Proportional to 12,820.58, 17,692.31 and 7,442.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.58 : 17,692.31 = 7,442.58 : x
2. Step 2: Convert to fraction form
   12,820.58/17,692.31 = 7,442.58/x
3. Step 3: Cross multiply
   12,820.58x = 17,692.31 × 7,442.58
4. Step 4: Simplify right side
   12,820.58x = 131,676,395.35
5. Step 5: Solve for x
   x = 131,676,395.35/12,820.58
6. Step 6: Final answer
   x = 10,270.71