Finding the Fourth Proportional to 21,816.96, 30,108.96 and 12,386.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,816.96 : 30,108.96 = 12,386.13 : x
2. Step 2: Convert to fraction form
   21,816.96/30,108.96 = 12,386.13/x
3. Step 3: Cross multiply
   21,816.96x = 30,108.96 × 12,386.13
4. Step 4: Simplify right side
   21,816.96x = 372,933,492.72
5. Step 5: Solve for x
   x = 372,933,492.72/21,816.96
6. Step 6: Final answer
   x = 17,093.74