Finding the Fourth Proportional to 21,900.83, 30,223.76 and 12,340.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,900.83 : 30,223.76 = 12,340.80 : x
2. Step 2: Convert to fraction form
   21,900.83/30,223.76 = 12,340.80/x
3. Step 3: Cross multiply
   21,900.83x = 30,223.76 × 12,340.80
4. Step 4: Simplify right side
   21,900.83x = 372,985,385.12
5. Step 5: Solve for x
   x = 372,985,385.12/21,900.83
6. Step 6: Final answer
   x = 17,030.65