Finding the Fourth Proportional to 42,820.73, 64,210.80 and 12,823.41

Step by Step Solution

1. Step 1: Write the proportion equation
   42,820.73 : 64,210.80 = 12,823.41 : x
2. Step 2: Convert to fraction form
   42,820.73/64,210.80 = 12,823.41/x
3. Step 3: Cross multiply
   42,820.73x = 64,210.80 × 12,823.41
4. Step 4: Simplify right side
   42,820.73x = 823,401,667.64
5. Step 5: Solve for x
   x = 823,401,667.64/42,820.73
6. Step 6: Final answer
   x = 19,229.05