Finding the Fourth Proportional to 31,321.39, 46,977.52 and 9,128.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,321.39 : 46,977.52 = 9,128.81 : x
2. Step 2: Convert to fraction form
   31,321.39/46,977.52 = 9,128.81/x
3. Step 3: Cross multiply
   31,321.39x = 46,977.52 × 9,128.81
4. Step 4: Simplify right side
   31,321.39x = 428,848,642.29
5. Step 5: Solve for x
   x = 428,848,642.29/31,321.39
6. Step 6: Final answer
   x = 13,691.88