Finding the Fourth Proportional to 12,972, 19,458.72 and 3,738.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,972 : 19,458.72 = 3,738.72 : x
2. Step 2: Convert to fraction form
   12,972/19,458.72 = 3,738.72/x
3. Step 3: Cross multiply
   12,972x = 19,458.72 × 3,738.72
4. Step 4: Simplify right side
   12,972x = 72,750,705.64
5. Step 5: Solve for x
   x = 72,750,705.64/12,972
6. Step 6: Final answer
   x = 5,608.29