Finding the Fourth Proportional to 21,980.64, 30,330.48 and 12,546.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,980.64 : 30,330.48 = 12,546.72 : x
2. Step 2: Convert to fraction form
   21,980.64/30,330.48 = 12,546.72/x
3. Step 3: Cross multiply
   21,980.64x = 30,330.48 × 12,546.72
4. Step 4: Simplify right side
   21,980.64x = 380,548,040.03
5. Step 5: Solve for x
   x = 380,548,040.03/21,980.64
6. Step 6: Final answer
   x = 17,312.87