Finding the Fourth Proportional to 768,100.84, 1,059,978.50 and 428,569.09

Step by Step Solution

1. Step 1: Write the proportion equation
   768,100.84 : 1,059,978.50 = 428,569.09 : x
2. Step 2: Convert to fraction form
   768,100.84/1,059,978.50 = 428,569.09/x
3. Step 3: Cross multiply
   768,100.84x = 1,059,978.50 × 428,569.09
4. Step 4: Simplify right side
   768,100.84x = 454,274,021,164.57
5. Step 5: Solve for x
   x = 454,274,021,164.57/768,100.84
6. Step 6: Final answer
   x = 591,424.98