Finding the Fourth Proportional to 776,865.89, 1,072,103.88 and 428,020.49

Step by Step Solution

1. Step 1: Write the proportion equation
   776,865.89 : 1,072,103.88 = 428,020.49 : x
2. Step 2: Convert to fraction form
   776,865.89/1,072,103.88 = 428,020.49/x
3. Step 3: Cross multiply
   776,865.89x = 1,072,103.88 × 428,020.49
4. Step 4: Simplify right side
   776,865.89x = 458,882,432,333.84
5. Step 5: Solve for x
   x = 458,882,432,333.84/776,865.89
6. Step 6: Final answer
   x = 590,684.23