Finding the Fourth Proportional to 31,157.96, 42,965.25 and 20,534

Step by Step Solution

1. Step 1: Write the proportion equation
   31,157.96 : 42,965.25 = 20,534 : x
2. Step 2: Convert to fraction form
   31,157.96/42,965.25 = 20,534/x
3. Step 3: Cross multiply
   31,157.96x = 42,965.25 × 20,534
4. Step 4: Simplify right side
   31,157.96x = 882,248,443.50
5. Step 5: Solve for x
   x = 882,248,443.50/31,157.96
6. Step 6: Final answer
   x = 28,315.35