Finding the Fourth Proportional to 42,564.38, 63,855.96 and 12,984.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,564.38 : 63,855.96 = 12,984.50 : x
2. Step 2: Convert to fraction form
   42,564.38/63,855.96 = 12,984.50/x
3. Step 3: Cross multiply
   42,564.38x = 63,855.96 × 12,984.50
4. Step 4: Simplify right side
   42,564.38x = 829,137,393.34
5. Step 5: Solve for x
   x = 829,137,393.34/42,564.38
6. Step 6: Final answer
   x = 19,479.61