Finding the Fourth Proportional to 31,499.42, 47,242.64 and 13,958.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,499.42 : 47,242.64 = 13,958.06 : x
2. Step 2: Convert to fraction form
   31,499.42/47,242.64 = 13,958.06/x
3. Step 3: Cross multiply
   31,499.42x = 47,242.64 × 13,958.06
4. Step 4: Simplify right side
   31,499.42x = 659,415,603.68
5. Step 5: Solve for x
   x = 659,415,603.68/31,499.42
6. Step 6: Final answer
   x = 20,934.21