Finding the Fourth Proportional to 123,611.24, 170,520.72 and 78,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,611.24 : 170,520.72 = 78,212.72 : x
2. Step 2: Convert to fraction form
   123,611.24/170,520.72 = 78,212.72/x
3. Step 3: Cross multiply
   123,611.24x = 170,520.72 × 78,212.72
4. Step 4: Simplify right side
   123,611.24x = 13,336,889,327.56
5. Step 5: Solve for x
   x = 13,336,889,327.56/123,611.24
6. Step 6: Final answer
   x = 107,893.82