Finding the Fourth Proportional to 47,048.40, 64,930.20 and 31,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   47,048.40 : 64,930.20 = 31,105.20 : x
2. Step 2: Convert to fraction form
   47,048.40/64,930.20 = 31,105.20/x
3. Step 3: Cross multiply
   47,048.40x = 64,930.20 × 31,105.20
4. Step 4: Simplify right side
   47,048.40x = 2,019,666,857.04
5. Step 5: Solve for x
   x = 2,019,666,857.04/47,048.40
6. Step 6: Final answer
   x = 42,927.43