Finding the Fourth Proportional to 20,700.27, 31,047.62 and 12,381.53

Step by Step Solution

1. Step 1: Write the proportion equation
   20,700.27 : 31,047.62 = 12,381.53 : x
2. Step 2: Convert to fraction form
   20,700.27/31,047.62 = 12,381.53/x
3. Step 3: Cross multiply
   20,700.27x = 31,047.62 × 12,381.53
4. Step 4: Simplify right side
   20,700.27x = 384,416,821.31
5. Step 5: Solve for x
   x = 384,416,821.31/20,700.27
6. Step 6: Final answer
   x = 18,570.62