Finding the Fourth Proportional to 21,561.48, 29,754.72 and 12,130.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,561.48 : 29,754.72 = 12,130.12 : x
2. Step 2: Convert to fraction form
   21,561.48/29,754.72 = 12,130.12/x
3. Step 3: Cross multiply
   21,561.48x = 29,754.72 × 12,130.12
4. Step 4: Simplify right side
   21,561.48x = 360,928,324.17
5. Step 5: Solve for x
   x = 360,928,324.17/21,561.48
6. Step 6: Final answer
   x = 16,739.50