Finding the Fourth Proportional to 123,578.88, 170,448.72 and 78,264.24

Step by Step Solution

1. Step 1: Write the proportion equation
   123,578.88 : 170,448.72 = 78,264.24 : x
2. Step 2: Convert to fraction form
   123,578.88/170,448.72 = 78,264.24/x
3. Step 3: Cross multiply
   123,578.88x = 170,448.72 × 78,264.24
4. Step 4: Simplify right side
   123,578.88x = 13,340,039,529.77
5. Step 5: Solve for x
   x = 13,340,039,529.77/123,578.88
6. Step 6: Final answer
   x = 107,947.57