Finding the Fourth Proportional to 151,185.78, 208,645.02 and 86,665.77

Step by Step Solution

1. Step 1: Write the proportion equation
   151,185.78 : 208,645.02 = 86,665.77 : x
2. Step 2: Convert to fraction form
   151,185.78/208,645.02 = 86,665.77/x
3. Step 3: Cross multiply
   151,185.78x = 208,645.02 × 86,665.77
4. Step 4: Simplify right side
   151,185.78x = 18,082,381,314.97
5. Step 5: Solve for x
   x = 18,082,381,314.97/151,185.78
6. Step 6: Final answer
   x = 119,603.72