Finding the Fourth Proportional to 47,978.30, 71,959.31 and 12,910.14

Step by Step Solution

1. Step 1: Write the proportion equation
   47,978.30 : 71,959.31 = 12,910.14 : x
2. Step 2: Convert to fraction form
   47,978.30/71,959.31 = 12,910.14/x
3. Step 3: Cross multiply
   47,978.30x = 71,959.31 × 12,910.14
4. Step 4: Simplify right side
   47,978.30x = 929,004,766.40
5. Step 5: Solve for x
   x = 929,004,766.40/47,978.30
6. Step 6: Final answer
   x = 19,363.02