Finding the Fourth Proportional to 81,850.86, 122,841.89 and 42,419.25

Step by Step Solution

1. Step 1: Write the proportion equation
   81,850.86 : 122,841.89 = 42,419.25 : x
2. Step 2: Convert to fraction form
   81,850.86/122,841.89 = 42,419.25/x
3. Step 3: Cross multiply
   81,850.86x = 122,841.89 × 42,419.25
4. Step 4: Simplify right side
   81,850.86x = 5,210,860,630.29
5. Step 5: Solve for x
   x = 5,210,860,630.29/81,850.86
6. Step 6: Final answer
   x = 63,662.87