Finding the Fourth Proportional to 780,390, 1,076,938.20 and 422,694

Step by Step Solution

1. Step 1: Write the proportion equation
   780,390 : 1,076,938.20 = 422,694 : x
2. Step 2: Convert to fraction form
   780,390/1,076,938.20 = 422,694/x
3. Step 3: Cross multiply
   780,390x = 1,076,938.20 × 422,694
4. Step 4: Simplify right side
   780,390x = 455,215,315,510.80
5. Step 5: Solve for x
   x = 455,215,315,510.80/780,390
6. Step 6: Final answer
   x = 583,317.72