Finding the Fourth Proportional to 22,320, 30,801.60 and 12,385.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,320 : 30,801.60 = 12,385.92 : x
2. Step 2: Convert to fraction form
   22,320/30,801.60 = 12,385.92/x
3. Step 3: Cross multiply
   22,320x = 30,801.60 × 12,385.92
4. Step 4: Simplify right side
   22,320x = 381,506,153.47
5. Step 5: Solve for x
   x = 381,506,153.47/22,320
6. Step 6: Final answer
   x = 17,092.57