Finding the Fourth Proportional to 139,345.82, 192,290.79 and 78,916.90

Step by Step Solution

1. Step 1: Write the proportion equation
   139,345.82 : 192,290.79 = 78,916.90 : x
2. Step 2: Convert to fraction form
   139,345.82/192,290.79 = 78,916.90/x
3. Step 3: Cross multiply
   139,345.82x = 192,290.79 × 78,916.90
4. Step 4: Simplify right side
   139,345.82x = 15,174,993,045.35
5. Step 5: Solve for x
   x = 15,174,993,045.35/139,345.82
6. Step 6: Final answer
   x = 108,901.67