Finding the Fourth Proportional to 21,812.76, 30,098.52 and 12,380.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,812.76 : 30,098.52 = 12,380.04 : x
2. Step 2: Convert to fraction form
   21,812.76/30,098.52 = 12,380.04/x
3. Step 3: Cross multiply
   21,812.76x = 30,098.52 × 12,380.04
4. Step 4: Simplify right side
   21,812.76x = 372,620,881.54
5. Step 5: Solve for x
   x = 372,620,881.54/21,812.76
6. Step 6: Final answer
   x = 17,082.70