Finding the Fourth Proportional to 31,861.34, 47,797.80 and 13,131.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,861.34 : 47,797.80 = 13,131.02 : x
2. Step 2: Convert to fraction form
   31,861.34/47,797.80 = 13,131.02/x
3. Step 3: Cross multiply
   31,861.34x = 47,797.80 × 13,131.02
4. Step 4: Simplify right side
   31,861.34x = 627,633,867.76
5. Step 5: Solve for x
   x = 627,633,867.76/31,861.34
6. Step 6: Final answer
   x = 19,698.92