Finding the Fourth Proportional to 21,783.64, 30,056.76 and 12,827.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,783.64 : 30,056.76 = 12,827.86 : x
2. Step 2: Convert to fraction form
   21,783.64/30,056.76 = 12,827.86/x
3. Step 3: Cross multiply
   21,783.64x = 30,056.76 × 12,827.86
4. Step 4: Simplify right side
   21,783.64x = 385,563,909.33
5. Step 5: Solve for x
   x = 385,563,909.33/21,783.64
6. Step 6: Final answer
   x = 17,699.70