Finding the Fourth Proportional to 309,578.04, 427,293.90 and 188,785.98

Step by Step Solution

1. Step 1: Write the proportion equation
   309,578.04 : 427,293.90 = 188,785.98 : x
2. Step 2: Convert to fraction form
   309,578.04/427,293.90 = 188,785.98/x
3. Step 3: Cross multiply
   309,578.04x = 427,293.90 × 188,785.98
4. Step 4: Simplify right side
   309,578.04x = 80,667,097,659.52
5. Step 5: Solve for x
   x = 80,667,097,659.52/309,578.04
6. Step 6: Final answer
   x = 260,571.12