Finding the Fourth Proportional to 279,012.43, 385,012.47 and 154,836.55

Step by Step Solution

1. Step 1: Write the proportion equation
   279,012.43 : 385,012.47 = 154,836.55 : x
2. Step 2: Convert to fraction form
   279,012.43/385,012.47 = 154,836.55/x
3. Step 3: Cross multiply
   279,012.43x = 385,012.47 × 154,836.55
4. Step 4: Simplify right side
   279,012.43x = 59,614,002,561.78
5. Step 5: Solve for x
   x = 59,614,002,561.78/279,012.43
6. Step 6: Final answer
   x = 213,660.74