Finding the Fourth Proportional to 39,870.72, 59,804.64 and 12,168

Step by Step Solution

1. Step 1: Write the proportion equation
   39,870.72 : 59,804.64 = 12,168 : x
2. Step 2: Convert to fraction form
   39,870.72/59,804.64 = 12,168/x
3. Step 3: Cross multiply
   39,870.72x = 59,804.64 × 12,168
4. Step 4: Simplify right side
   39,870.72x = 727,702,859.52
5. Step 5: Solve for x
   x = 727,702,859.52/39,870.72
6. Step 6: Final answer
   x = 18,251.56