Finding the Fourth Proportional to 31,609.09, 47,385.69 and 12,904.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,609.09 : 47,385.69 = 12,904.75 : x
2. Step 2: Convert to fraction form
   31,609.09/47,385.69 = 12,904.75/x
3. Step 3: Cross multiply
   31,609.09x = 47,385.69 × 12,904.75
4. Step 4: Simplify right side
   31,609.09x = 611,500,483.03
5. Step 5: Solve for x
   x = 611,500,483.03/31,609.09
6. Step 6: Final answer
   x = 19,345.72