Finding the Fourth Proportional to 31,430.82, 47,128.38 and 10,365.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,430.82 : 47,128.38 = 10,365.12 : x
2. Step 2: Convert to fraction form
   31,430.82/47,128.38 = 10,365.12/x
3. Step 3: Cross multiply
   31,430.82x = 47,128.38 × 10,365.12
4. Step 4: Simplify right side
   31,430.82x = 488,491,314.11
5. Step 5: Solve for x
   x = 488,491,314.11/31,430.82
6. Step 6: Final answer
   x = 15,541.79