Finding the Fourth Proportional to 67,893.78, 101,839.12 and 39,990.83

Step by Step Solution

1. Step 1: Write the proportion equation
   67,893.78 : 101,839.12 = 39,990.83 : x
2. Step 2: Convert to fraction form
   67,893.78/101,839.12 = 39,990.83/x
3. Step 3: Cross multiply
   67,893.78x = 101,839.12 × 39,990.83
4. Step 4: Simplify right side
   67,893.78x = 4,072,631,089.89
5. Step 5: Solve for x
   x = 4,072,631,089.89/67,893.78
6. Step 6: Final answer
   x = 59,985.33