Finding the Fourth Proportional to 123,669.48, 170,688.18 and 72,698.70

Step by Step Solution

1. Step 1: Write the proportion equation
   123,669.48 : 170,688.18 = 72,698.70 : x
2. Step 2: Convert to fraction form
   123,669.48/170,688.18 = 72,698.70/x
3. Step 3: Cross multiply
   123,669.48x = 170,688.18 × 72,698.70
4. Step 4: Simplify right side
   123,669.48x = 12,408,808,791.37
5. Step 5: Solve for x
   x = 12,408,808,791.37/123,669.48
6. Step 6: Final answer
   x = 100,338.49