Finding the Fourth Proportional to 20,061.54, 27,677.49 and 12,991.86

Step by Step Solution

1. Step 1: Write the proportion equation
   20,061.54 : 27,677.49 = 12,991.86 : x
2. Step 2: Convert to fraction form
   20,061.54/27,677.49 = 12,991.86/x
3. Step 3: Cross multiply
   20,061.54x = 27,677.49 × 12,991.86
4. Step 4: Simplify right side
   20,061.54x = 359,582,075.23
5. Step 5: Solve for x
   x = 359,582,075.23/20,061.54
6. Step 6: Final answer
   x = 17,923.95