Finding the Fourth Proportional to 129,104.36, 178,111.98 and 78,028.42

Step by Step Solution

1. Step 1: Write the proportion equation
   129,104.36 : 178,111.98 = 78,028.42 : x
2. Step 2: Convert to fraction form
   129,104.36/178,111.98 = 78,028.42/x
3. Step 3: Cross multiply
   129,104.36x = 178,111.98 × 78,028.42
4. Step 4: Simplify right side
   129,104.36x = 13,897,796,382.47
5. Step 5: Solve for x
   x = 13,897,796,382.47/129,104.36
6. Step 6: Final answer
   x = 107,647.77