Finding the Fourth Proportional to 12,878.42, 17,768.06 and 7,212.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,878.42 : 17,768.06 = 7,212.32 : x
2. Step 2: Convert to fraction form
   12,878.42/17,768.06 = 7,212.32/x
3. Step 3: Cross multiply
   12,878.42x = 17,768.06 × 7,212.32
4. Step 4: Simplify right side
   12,878.42x = 128,148,934.50
5. Step 5: Solve for x
   x = 128,148,934.50/12,878.42
6. Step 6: Final answer
   x = 9,950.67