Finding the Fourth Proportional to 21,829.59, 30,124.88 and 12,398.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,829.59 : 30,124.88 = 12,398.16 : x
2. Step 2: Convert to fraction form
   21,829.59/30,124.88 = 12,398.16/x
3. Step 3: Cross multiply
   21,829.59x = 30,124.88 × 12,398.16
4. Step 4: Simplify right side
   21,829.59x = 373,492,953.75
5. Step 5: Solve for x
   x = 373,492,953.75/21,829.59
6. Step 6: Final answer
   x = 17,109.48