Finding the Fourth Proportional to 678,790.86, 1,018,188.72 and 229,515.45

Step by Step Solution

1. Step 1: Write the proportion equation
   678,790.86 : 1,018,188.72 = 229,515.45 : x
2. Step 2: Convert to fraction form
   678,790.86/1,018,188.72 = 229,515.45/x
3. Step 3: Cross multiply
   678,790.86x = 1,018,188.72 × 229,515.45
4. Step 4: Simplify right side
   678,790.86x = 233,690,042,255.72
5. Step 5: Solve for x
   x = 233,690,042,255.72/678,790.86
6. Step 6: Final answer
   x = 344,274.00