Finding the Fourth Proportional to 31,445.21, 43,364.61 and 20,118.29

Step by Step Solution

1. Step 1: Write the proportion equation
   31,445.21 : 43,364.61 = 20,118.29 : x
2. Step 2: Convert to fraction form
   31,445.21/43,364.61 = 20,118.29/x
3. Step 3: Cross multiply
   31,445.21x = 43,364.61 × 20,118.29
4. Step 4: Simplify right side
   31,445.21x = 872,421,799.72
5. Step 5: Solve for x
   x = 872,421,799.72/31,445.21
6. Step 6: Final answer
   x = 27,744.19