Finding the Fourth Proportional to 139,755.72, 192,858.67 and 77,665.99

Step by Step Solution

1. Step 1: Write the proportion equation
   139,755.72 : 192,858.67 = 77,665.99 : x
2. Step 2: Convert to fraction form
   139,755.72/192,858.67 = 77,665.99/x
3. Step 3: Cross multiply
   139,755.72x = 192,858.67 × 77,665.99
4. Step 4: Simplify right side
   139,755.72x = 14,978,559,512.18
5. Step 5: Solve for x
   x = 14,978,559,512.18/139,755.72
6. Step 6: Final answer
   x = 107,176.72