Finding the Fourth Proportional to 31,176.96, 42,991.47 and 20,553

Step by Step Solution

1. Step 1: Write the proportion equation
   31,176.96 : 42,991.47 = 20,553 : x
2. Step 2: Convert to fraction form
   31,176.96/42,991.47 = 20,553/x
3. Step 3: Cross multiply
   31,176.96x = 42,991.47 × 20,553
4. Step 4: Simplify right side
   31,176.96x = 883,603,682.91
5. Step 5: Solve for x
   x = 883,603,682.91/31,176.96
6. Step 6: Final answer
   x = 28,341.56