Finding the Fourth Proportional to 12,005.42, 17,999.39 and 5,678.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.42 : 17,999.39 = 5,678.06 : x
2. Step 2: Convert to fraction form
   12,005.42/17,999.39 = 5,678.06/x
3. Step 3: Cross multiply
   12,005.42x = 17,999.39 × 5,678.06
4. Step 4: Simplify right side
   12,005.42x = 102,201,498.00
5. Step 5: Solve for x
   x = 102,201,498.00/12,005.42
6. Step 6: Final answer
   x = 8,512.95