Finding the Fourth Proportional to 143,071.12, 197,436.72 and 79,407.28

Step by Step Solution

1. Step 1: Write the proportion equation
   143,071.12 : 197,436.72 = 79,407.28 : x
2. Step 2: Convert to fraction form
   143,071.12/197,436.72 = 79,407.28/x
3. Step 3: Cross multiply
   143,071.12x = 197,436.72 × 79,407.28
4. Step 4: Simplify right side
   143,071.12x = 15,677,912,907.32
5. Step 5: Solve for x
   x = 15,677,912,907.32/143,071.12
6. Step 6: Final answer
   x = 109,581.26