Finding the Fourth Proportional to 78,196.78, 107,911.45 and 42,386.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,196.78 : 107,911.45 = 42,386.78 : x
2. Step 2: Convert to fraction form
   78,196.78/107,911.45 = 42,386.78/x
3. Step 3: Cross multiply
   78,196.78x = 107,911.45 × 42,386.78
4. Step 4: Simplify right side
   78,196.78x = 4,574,018,678.70
5. Step 5: Solve for x
   x = 4,574,018,678.70/78,196.78
6. Step 6: Final answer
   x = 58,493.70