Finding the Fourth Proportional to 276,128.56, 381,059.69 and 155,268.79

Step by Step Solution

1. Step 1: Write the proportion equation
   276,128.56 : 381,059.69 = 155,268.79 : x
2. Step 2: Convert to fraction form
   276,128.56/381,059.69 = 155,268.79/x
3. Step 3: Cross multiply
   276,128.56x = 381,059.69 × 155,268.79
4. Step 4: Simplify right side
   276,128.56x = 59,166,677,200.20
5. Step 5: Solve for x
   x = 59,166,677,200.20/276,128.56
6. Step 6: Final answer
   x = 214,272.21