Finding the Fourth Proportional to 81,780.39, 122,646.89 and 31,849.35

Step by Step Solution

1. Step 1: Write the proportion equation
   81,780.39 : 122,646.89 = 31,849.35 : x
2. Step 2: Convert to fraction form
   81,780.39/122,646.89 = 31,849.35/x
3. Step 3: Cross multiply
   81,780.39x = 122,646.89 × 31,849.35
4. Step 4: Simplify right side
   81,780.39x = 3,906,223,566.77
5. Step 5: Solve for x
   x = 3,906,223,566.77/81,780.39
6. Step 6: Final answer
   x = 47,764.80