Finding the Fourth Proportional to 123,804, 170,856 and 72,819.36

Step by Step Solution

1. Step 1: Write the proportion equation
   123,804 : 170,856 = 72,819.36 : x
2. Step 2: Convert to fraction form
   123,804/170,856 = 72,819.36/x
3. Step 3: Cross multiply
   123,804x = 170,856 × 72,819.36
4. Step 4: Simplify right side
   123,804x = 12,441,624,572.16
5. Step 5: Solve for x
   x = 12,441,624,572.16/123,804
6. Step 6: Final answer
   x = 100,494.53