Finding the Fourth Proportional to 20,781.89, 31,168.38 and 5,988.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,781.89 : 31,168.38 = 5,988.05 : x
2. Step 2: Convert to fraction form
   20,781.89/31,168.38 = 5,988.05/x
3. Step 3: Cross multiply
   20,781.89x = 31,168.38 × 5,988.05
4. Step 4: Simplify right side
   20,781.89x = 186,637,817.86
5. Step 5: Solve for x
   x = 186,637,817.86/20,781.89
6. Step 6: Final answer
   x = 8,980.79