Finding the Fourth Proportional to 143,167.31, 197,573.36 and 78,639.27

Step by Step Solution

1. Step 1: Write the proportion equation
   143,167.31 : 197,573.36 = 78,639.27 : x
2. Step 2: Convert to fraction form
   143,167.31/197,573.36 = 78,639.27/x
3. Step 3: Cross multiply
   143,167.31x = 197,573.36 × 78,639.27
4. Step 4: Simplify right side
   143,167.31x = 15,537,023,667.75
5. Step 5: Solve for x
   x = 15,537,023,667.75/143,167.31
6. Step 6: Final answer
   x = 108,523.54