Finding the Fourth Proportional to 118,916.78, 164,107.38 and 65,198.57

Step by Step Solution

1. Step 1: Write the proportion equation
   118,916.78 : 164,107.38 = 65,198.57 : x
2. Step 2: Convert to fraction form
   118,916.78/164,107.38 = 65,198.57/x
3. Step 3: Cross multiply
   118,916.78x = 164,107.38 × 65,198.57
4. Step 4: Simplify right side
   118,916.78x = 10,699,566,502.45
5. Step 5: Solve for x
   x = 10,699,566,502.45/118,916.78
6. Step 6: Final answer
   x = 89,975.25