Finding the Fourth Proportional to 142,981.76, 214,390.54 and 54,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,981.76 : 214,390.54 = 54,178.72 : x
2. Step 2: Convert to fraction form
   142,981.76/214,390.54 = 54,178.72/x
3. Step 3: Cross multiply
   142,981.76x = 214,390.54 × 54,178.72
4. Step 4: Simplify right side
   142,981.76x = 11,615,405,037.31
5. Step 5: Solve for x
   x = 11,615,405,037.31/142,981.76
6. Step 6: Final answer
   x = 81,236.97