Finding the Fourth Proportional to 123,369.84, 170,081 and 78,025.20

Step by Step Solution

1. Step 1: Write the proportion equation
   123,369.84 : 170,081 = 78,025.20 : x
2. Step 2: Convert to fraction form
   123,369.84/170,081 = 78,025.20/x
3. Step 3: Cross multiply
   123,369.84x = 170,081 × 78,025.20
4. Step 4: Simplify right side
   123,369.84x = 13,270,604,041.20
5. Step 5: Solve for x
   x = 13,270,604,041.20/123,369.84
6. Step 6: Final answer
   x = 107,567.65