Finding the Fourth Proportional to 123,615.24, 170,526.24 and 78,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,615.24 : 170,526.24 = 78,216.72 : x
2. Step 2: Convert to fraction form
   123,615.24/170,526.24 = 78,216.72/x
3. Step 3: Cross multiply
   123,615.24x = 170,526.24 × 78,216.72
4. Step 4: Simplify right side
   123,615.24x = 13,338,003,166.73
5. Step 5: Solve for x
   x = 13,338,003,166.73/123,615.24
6. Step 6: Final answer
   x = 107,899.34