Finding the Fourth Proportional to 12,085.07, 18,128.27 and 3,319.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.07 : 18,128.27 = 3,319.79 : x
2. Step 2: Convert to fraction form
   12,085.07/18,128.27 = 3,319.79/x
3. Step 3: Cross multiply
   12,085.07x = 18,128.27 × 3,319.79
4. Step 4: Simplify right side
   12,085.07x = 60,181,967.12
5. Step 5: Solve for x
   x = 60,181,967.12/12,085.07
6. Step 6: Final answer
   x = 4,979.86