Finding the Fourth Proportional to 21,833.02, 30,128.70 and 12,400.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,833.02 : 30,128.70 = 12,400.54 : x
2. Step 2: Convert to fraction form
   21,833.02/30,128.70 = 12,400.54/x
3. Step 3: Cross multiply
   21,833.02x = 30,128.70 × 12,400.54
4. Step 4: Simplify right side
   21,833.02x = 373,612,149.50
5. Step 5: Solve for x
   x = 373,612,149.50/21,833.02
6. Step 6: Final answer
   x = 17,112.25