Finding the Fourth Proportional to 42,440.59, 63,667.49 and 12,851.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42,440.59 : 63,667.49 = 12,851.38 : x
2. Step 2: Convert to fraction form
   42,440.59/63,667.49 = 12,851.38/x
3. Step 3: Cross multiply
   42,440.59x = 63,667.49 × 12,851.38
4. Step 4: Simplify right side
   42,440.59x = 818,214,884.21
5. Step 5: Solve for x
   x = 818,214,884.21/42,440.59
6. Step 6: Final answer
   x = 19,279.07