Finding the Fourth Proportional to 780,426, 1,076,987.88 and 422,730

Step by Step Solution

1. Step 1: Write the proportion equation
   780,426 : 1,076,987.88 = 422,730 : x
2. Step 2: Convert to fraction form
   780,426/1,076,987.88 = 422,730/x
3. Step 3: Cross multiply
   780,426x = 1,076,987.88 × 422,730
4. Step 4: Simplify right side
   780,426x = 455,275,086,512.40
5. Step 5: Solve for x
   x = 455,275,086,512.40/780,426
6. Step 6: Final answer
   x = 583,367.40