Finding the Fourth Proportional to 31,685.21, 43,807.68 and 30,291

Step by Step Solution

1. Step 1: Write the proportion equation
   31,685.21 : 43,807.68 = 30,291 : x
2. Step 2: Convert to fraction form
   31,685.21/43,807.68 = 30,291/x
3. Step 3: Cross multiply
   31,685.21x = 43,807.68 × 30,291
4. Step 4: Simplify right side
   31,685.21x = 1,326,978,434.88
5. Step 5: Solve for x
   x = 1,326,978,434.88/31,685.21
6. Step 6: Final answer
   x = 41,880.06