Finding the Fourth Proportional to 674,559.50, 930,928.14 and 388,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   674,559.50 : 930,928.14 = 388,123.25 : x
2. Step 2: Convert to fraction form
   674,559.50/930,928.14 = 388,123.25/x
3. Step 3: Cross multiply
   674,559.50x = 930,928.14 × 388,123.25
4. Step 4: Simplify right side
   674,559.50x = 361,314,850,558.61
5. Step 5: Solve for x
   x = 361,314,850,558.61/674,559.50
6. Step 6: Final answer
   x = 535,630.81