Finding the Fourth Proportional to 142,494.18, 196,647.75 and 78,830.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142,494.18 : 196,647.75 = 78,830.88 : x
2. Step 2: Convert to fraction form
   142,494.18/196,647.75 = 78,830.88/x
3. Step 3: Cross multiply
   142,494.18x = 196,647.75 × 78,830.88
4. Step 4: Simplify right side
   142,494.18x = 15,501,915,182.52
5. Step 5: Solve for x
   x = 15,501,915,182.52/142,494.18
6. Step 6: Final answer
   x = 108,789.81