Finding the Fourth Proportional to 139,832.16, 192,981.96 and 86,153.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,832.16 : 192,981.96 = 86,153.28 : x
2. Step 2: Convert to fraction form
   139,832.16/192,981.96 = 86,153.28/x
3. Step 3: Cross multiply
   139,832.16x = 192,981.96 × 86,153.28
4. Step 4: Simplify right side
   139,832.16x = 16,626,028,834.83
5. Step 5: Solve for x
   x = 16,626,028,834.83/139,832.16
6. Step 6: Final answer
   x = 118,899.89