Finding the Fourth Proportional to 70,631.94, 105,919.74 and 31,161

Step by Step Solution

1. Step 1: Write the proportion equation
   70,631.94 : 105,919.74 = 31,161 : x
2. Step 2: Convert to fraction form
   70,631.94/105,919.74 = 31,161/x
3. Step 3: Cross multiply
   70,631.94x = 105,919.74 × 31,161
4. Step 4: Simplify right side
   70,631.94x = 3,300,565,018.14
5. Step 5: Solve for x
   x = 3,300,565,018.14/70,631.94
6. Step 6: Final answer
   x = 46,729.07