Finding the Fourth Proportional to 31,980.56, 47,986.32 and 13,274.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,980.56 : 47,986.32 = 13,274.96 : x
2. Step 2: Convert to fraction form
   31,980.56/47,986.32 = 13,274.96/x
3. Step 3: Cross multiply
   31,980.56x = 47,986.32 × 13,274.96
4. Step 4: Simplify right side
   31,980.56x = 637,016,478.55
5. Step 5: Solve for x
   x = 637,016,478.55/31,980.56
6. Step 6: Final answer
   x = 19,918.87