Finding the Fourth Proportional to 31,706.31, 43,783.77 and 20,402.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,706.31 : 43,783.77 = 20,402.25 : x
2. Step 2: Convert to fraction form
   31,706.31/43,783.77 = 20,402.25/x
3. Step 3: Cross multiply
   31,706.31x = 43,783.77 × 20,402.25
4. Step 4: Simplify right side
   31,706.31x = 893,287,421.48
5. Step 5: Solve for x
   x = 893,287,421.48/31,706.31
6. Step 6: Final answer
   x = 28,173.81