Finding the Fourth Proportional to 78,815.69, 118,181.79 and 34,390.57

Step by Step Solution

1. Step 1: Write the proportion equation
   78,815.69 : 118,181.79 = 34,390.57 : x
2. Step 2: Convert to fraction form
   78,815.69/118,181.79 = 34,390.57/x
3. Step 3: Cross multiply
   78,815.69x = 118,181.79 × 34,390.57
4. Step 4: Simplify right side
   78,815.69x = 4,064,338,826.27
5. Step 5: Solve for x
   x = 4,064,338,826.27/78,815.69
6. Step 6: Final answer
   x = 51,567.63