Finding the Fourth Proportional to 31,078.88, 46,670.16 and 20,422.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.88 : 46,670.16 = 20,422.88 : x
2. Step 2: Convert to fraction form
   31,078.88/46,670.16 = 20,422.88/x
3. Step 3: Cross multiply
   31,078.88x = 46,670.16 × 20,422.88
4. Step 4: Simplify right side
   31,078.88x = 953,139,077.26
5. Step 5: Solve for x
   x = 953,139,077.26/31,078.88
6. Step 6: Final answer
   x = 30,668.39