Finding the Fourth Proportional to 142,479.42, 196,621.74 and 78,821.52

Step by Step Solution

1. Step 1: Write the proportion equation
   142,479.42 : 196,621.74 = 78,821.52 : x
2. Step 2: Convert to fraction form
   142,479.42/196,621.74 = 78,821.52/x
3. Step 3: Cross multiply
   142,479.42x = 196,621.74 × 78,821.52
4. Step 4: Simplify right side
   142,479.42x = 15,498,024,411.84
5. Step 5: Solve for x
   x = 15,498,024,411.84/142,479.42
6. Step 6: Final answer
   x = 108,773.78