Finding the Fourth Proportional to 78,111.94, 117,143.70 and 28,185.58

Step by Step Solution

1. Step 1: Write the proportion equation
   78,111.94 : 117,143.70 = 28,185.58 : x
2. Step 2: Convert to fraction form
   78,111.94/117,143.70 = 28,185.58/x
3. Step 3: Cross multiply
   78,111.94x = 117,143.70 × 28,185.58
4. Step 4: Simplify right side
   78,111.94x = 3,301,763,127.85
5. Step 5: Solve for x
   x = 3,301,763,127.85/78,111.94
6. Step 6: Final answer
   x = 42,269.63