Finding the Fourth Proportional to 212,100.96, 318,144.15 and 54,330.78

Step by Step Solution

1. Step 1: Write the proportion equation
   212,100.96 : 318,144.15 = 54,330.78 : x
2. Step 2: Convert to fraction form
   212,100.96/318,144.15 = 54,330.78/x
3. Step 3: Cross multiply
   212,100.96x = 318,144.15 × 54,330.78
4. Step 4: Simplify right side
   212,100.96x = 17,285,019,821.94
5. Step 5: Solve for x
   x = 17,285,019,821.94/212,100.96
6. Step 6: Final answer
   x = 81,494.30