Finding the Fourth Proportional to 81,887.72, 122,758.52 and 31,956.21

Step by Step Solution

1. Step 1: Write the proportion equation
   81,887.72 : 122,758.52 = 31,956.21 : x
2. Step 2: Convert to fraction form
   81,887.72/122,758.52 = 31,956.21/x
3. Step 3: Cross multiply
   81,887.72x = 122,758.52 × 31,956.21
4. Step 4: Simplify right side
   81,887.72x = 3,922,897,044.41
5. Step 5: Solve for x
   x = 3,922,897,044.41/81,887.72
6. Step 6: Final answer
   x = 47,905.80