Finding the Fourth Proportional to 31,536.81, 47,305.15 and 10,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,536.81 : 47,305.15 = 10,478.50 : x
2. Step 2: Convert to fraction form
   31,536.81/47,305.15 = 10,478.50/x
3. Step 3: Cross multiply
   31,536.81x = 47,305.15 × 10,478.50
4. Step 4: Simplify right side
   31,536.81x = 495,686,869.82
5. Step 5: Solve for x
   x = 495,686,869.82/31,536.81
6. Step 6: Final answer
   x = 15,717.72