Finding the Fourth Proportional to 42,142.75, 63,217.77 and 10,978

Step by Step Solution

1. Step 1: Write the proportion equation
   42,142.75 : 63,217.77 = 10,978 : x
2. Step 2: Convert to fraction form
   42,142.75/63,217.77 = 10,978/x
3. Step 3: Cross multiply
   42,142.75x = 63,217.77 × 10,978
4. Step 4: Simplify right side
   42,142.75x = 694,004,679.06
5. Step 5: Solve for x
   x = 694,004,679.06/42,142.75
6. Step 6: Final answer
   x = 16,467.95