Finding the Fourth Proportional to 143,167.57, 197,573.63 and 78,642.78

Step by Step Solution

1. Step 1: Write the proportion equation
   143,167.57 : 197,573.63 = 78,642.78 : x
2. Step 2: Convert to fraction form
   143,167.57/197,573.63 = 78,642.78/x
3. Step 3: Cross multiply
   143,167.57x = 197,573.63 × 78,642.78
4. Step 4: Simplify right side
   143,167.57x = 15,537,739,517.89
5. Step 5: Solve for x
   x = 15,537,739,517.89/143,167.57
6. Step 6: Final answer
   x = 108,528.35