Finding the Fourth Proportional to 139,412.81, 192,389.01 and 78,983.33

Step by Step Solution

1. Step 1: Write the proportion equation
   139,412.81 : 192,389.01 = 78,983.33 : x
2. Step 2: Convert to fraction form
   139,412.81/192,389.01 = 78,983.33/x
3. Step 3: Cross multiply
   139,412.81x = 192,389.01 × 78,983.33
4. Step 4: Simplify right side
   139,412.81x = 15,195,523,407.07
5. Step 5: Solve for x
   x = 15,195,523,407.07/139,412.81
6. Step 6: Final answer
   x = 108,996.61