Finding the Fourth Proportional to 31,858.41, 47,793.37 and 13,128.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,858.41 : 47,793.37 = 13,128.02 : x
2. Step 2: Convert to fraction form
   31,858.41/47,793.37 = 13,128.02/x
3. Step 3: Cross multiply
   31,858.41x = 47,793.37 × 13,128.02
4. Step 4: Simplify right side
   31,858.41x = 627,432,481.20
5. Step 5: Solve for x
   x = 627,432,481.20/31,858.41
6. Step 6: Final answer
   x = 19,694.40