Finding the Fourth Proportional to 31,173.96, 42,987.33 and 20,550

Step by Step Solution

1. Step 1: Write the proportion equation
   31,173.96 : 42,987.33 = 20,550 : x
2. Step 2: Convert to fraction form
   31,173.96/42,987.33 = 20,550/x
3. Step 3: Cross multiply
   31,173.96x = 42,987.33 × 20,550
4. Step 4: Simplify right side
   31,173.96x = 883,389,631.50
5. Step 5: Solve for x
   x = 883,389,631.50/31,173.96
6. Step 6: Final answer
   x = 28,337.42