Finding the Fourth Proportional to 31,031.27, 42,773.36 and 20,956.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,031.27 : 42,773.36 = 20,956.49 : x
2. Step 2: Convert to fraction form
   31,031.27/42,773.36 = 20,956.49/x
3. Step 3: Cross multiply
   31,031.27x = 42,773.36 × 20,956.49
4. Step 4: Simplify right side
   31,031.27x = 896,379,172.46
5. Step 5: Solve for x
   x = 896,379,172.46/31,031.27
6. Step 6: Final answer
   x = 28,886.32