Finding the Fourth Proportional to 762,480.72, 1,052,111.88 and 440,139.60

Step by Step Solution

1. Step 1: Write the proportion equation
   762,480.72 : 1,052,111.88 = 440,139.60 : x
2. Step 2: Convert to fraction form
   762,480.72/1,052,111.88 = 440,139.60/x
3. Step 3: Cross multiply
   762,480.72x = 1,052,111.88 × 440,139.60
4. Step 4: Simplify right side
   762,480.72x = 463,076,102,018.45
5. Step 5: Solve for x
   x = 463,076,102,018.45/762,480.72
6. Step 6: Final answer
   x = 607,328.28