Finding the Fourth Proportional to 31,435.02, 47,119.59 and 12,728.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,435.02 : 47,119.59 = 12,728.34 : x
2. Step 2: Convert to fraction form
   31,435.02/47,119.59 = 12,728.34/x
3. Step 3: Cross multiply
   31,435.02x = 47,119.59 × 12,728.34
4. Step 4: Simplify right side
   31,435.02x = 599,754,162.18
5. Step 5: Solve for x
   x = 599,754,162.18/31,435.02
6. Step 6: Final answer
   x = 19,079.17