Finding the Fourth Proportional to 78,119.82, 107,804.79 and 42,309

Step by Step Solution

1. Step 1: Write the proportion equation
   78,119.82 : 107,804.79 = 42,309 : x
2. Step 2: Convert to fraction form
   78,119.82/107,804.79 = 42,309/x
3. Step 3: Cross multiply
   78,119.82x = 107,804.79 × 42,309
4. Step 4: Simplify right side
   78,119.82x = 4,561,112,860.11
5. Step 5: Solve for x
   x = 4,561,112,860.11/78,119.82
6. Step 6: Final answer
   x = 58,386.12