Finding the Fourth Proportional to 399,641.50, 599,758.17 and 189,280.09

Step by Step Solution

1. Step 1: Write the proportion equation
   399,641.50 : 599,758.17 = 189,280.09 : x
2. Step 2: Convert to fraction form
   399,641.50/599,758.17 = 189,280.09/x
3. Step 3: Cross multiply
   399,641.50x = 599,758.17 × 189,280.09
4. Step 4: Simplify right side
   399,641.50x = 113,522,280,395.84
5. Step 5: Solve for x
   x = 113,522,280,395.84/399,641.50
6. Step 6: Final answer
   x = 284,060.29