Finding the Fourth Proportional to 42,143.80, 63,219.32 and 10,979

Step by Step Solution

1. Step 1: Write the proportion equation
   42,143.80 : 63,219.32 = 10,979 : x
2. Step 2: Convert to fraction form
   42,143.80/63,219.32 = 10,979/x
3. Step 3: Cross multiply
   42,143.80x = 63,219.32 × 10,979
4. Step 4: Simplify right side
   42,143.80x = 694,084,914.28
5. Step 5: Solve for x
   x = 694,084,914.28/42,143.80
6. Step 6: Final answer
   x = 16,469.44