Finding the Fourth Proportional to 142,878.05, 214,352.72 and 100,840.25

Step by Step Solution

1. Step 1: Write the proportion equation
   142,878.05 : 214,352.72 = 100,840.25 : x
2. Step 2: Convert to fraction form
   142,878.05/214,352.72 = 100,840.25/x
3. Step 3: Cross multiply
   142,878.05x = 214,352.72 × 100,840.25
4. Step 4: Simplify right side
   142,878.05x = 21,615,382,282.81
5. Step 5: Solve for x
   x = 21,615,382,282.81/142,878.05
6. Step 6: Final answer
   x = 151,285.54