Finding the Fourth Proportional to 81,919.62, 122,881.86 and 31,997.70

Step by Step Solution

1. Step 1: Write the proportion equation
   81,919.62 : 122,881.86 = 31,997.70 : x
2. Step 2: Convert to fraction form
   81,919.62/122,881.86 = 31,997.70/x
3. Step 3: Cross multiply
   81,919.62x = 122,881.86 × 31,997.70
4. Step 4: Simplify right side
   81,919.62x = 3,931,936,891.72
5. Step 5: Solve for x
   x = 3,931,936,891.72/81,919.62
6. Step 6: Final answer
   x = 47,997.50