Finding the Fourth Proportional to 123,826.15, 170,870.41 and 72,840.80

Step by Step Solution

1. Step 1: Write the proportion equation
   123,826.15 : 170,870.41 = 72,840.80 : x
2. Step 2: Convert to fraction form
   123,826.15/170,870.41 = 72,840.80/x
3. Step 3: Cross multiply
   123,826.15x = 170,870.41 × 72,840.80
4. Step 4: Simplify right side
   123,826.15x = 12,446,337,878.96
5. Step 5: Solve for x
   x = 12,446,337,878.96/123,826.15
6. Step 6: Final answer
   x = 100,514.61