Finding the Fourth Proportional to 139,699.89, 192,790.02 and 86,015.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,699.89 : 192,790.02 = 86,015.88 : x
2. Step 2: Convert to fraction form
   139,699.89/192,790.02 = 86,015.88/x
3. Step 3: Cross multiply
   139,699.89x = 192,790.02 × 86,015.88
4. Step 4: Simplify right side
   139,699.89x = 16,583,003,225.52
5. Step 5: Solve for x
   x = 16,583,003,225.52/139,699.89
6. Step 6: Final answer
   x = 118,704.48