Finding the Fourth Proportional to 276,215.31, 381,173.36 and 155,356.56

Step by Step Solution

1. Step 1: Write the proportion equation
   276,215.31 : 381,173.36 = 155,356.56 : x
2. Step 2: Convert to fraction form
   276,215.31/381,173.36 = 155,356.56/x
3. Step 3: Cross multiply
   276,215.31x = 381,173.36 × 155,356.56
4. Step 4: Simplify right side
   276,215.31x = 59,217,781,196.46
5. Step 5: Solve for x
   x = 59,217,781,196.46/276,215.31
6. Step 6: Final answer
   x = 214,389.93