Finding the Fourth Proportional to 142,649.14, 196,853.41 and 78,985.57

Step by Step Solution

1. Step 1: Write the proportion equation
   142,649.14 : 196,853.41 = 78,985.57 : x
2. Step 2: Convert to fraction form
   142,649.14/196,853.41 = 78,985.57/x
3. Step 3: Cross multiply
   142,649.14x = 196,853.41 × 78,985.57
4. Step 4: Simplify right side
   142,649.14x = 15,548,578,597.83
5. Step 5: Solve for x
   x = 15,548,578,597.83/142,649.14
6. Step 6: Final answer
   x = 108,998.75