Finding the Fourth Proportional to 142,493.77, 196,640.58 and 78,830.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,493.77 : 196,640.58 = 78,830.20 : x
2. Step 2: Convert to fraction form
   142,493.77/196,640.58 = 78,830.20/x
3. Step 3: Cross multiply
   142,493.77x = 196,640.58 × 78,830.20
4. Step 4: Simplify right side
   142,493.77x = 15,501,216,249.52
5. Step 5: Solve for x
   x = 15,501,216,249.52/142,493.77
6. Step 6: Final answer
   x = 108,785.22