Finding the Fourth Proportional to 139,317.72, 192,260.37 and 78,887.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,317.72 : 192,260.37 = 78,887.06 : x
2. Step 2: Convert to fraction form
   139,317.72/192,260.37 = 78,887.06/x
3. Step 3: Cross multiply
   139,317.72x = 192,260.37 × 78,887.06
4. Step 4: Simplify right side
   139,317.72x = 15,166,855,399.31
5. Step 5: Solve for x
   x = 15,166,855,399.31/139,317.72
6. Step 6: Final answer
   x = 108,865.23