Finding the Fourth Proportional to 276,790.72, 381,892.16 and 155,889.72

Step by Step Solution

1. Step 1: Write the proportion equation
   276,790.72 : 381,892.16 = 155,889.72 : x
2. Step 2: Convert to fraction form
   276,790.72/381,892.16 = 155,889.72/x
3. Step 3: Cross multiply
   276,790.72x = 381,892.16 × 155,889.72
4. Step 4: Simplify right side
   276,790.72x = 59,533,061,892.60
5. Step 5: Solve for x
   x = 59,533,061,892.60/276,790.72
6. Step 6: Final answer
   x = 215,083.30