Finding the Fourth Proportional to 1,066,654.12, 1,600,571.58 and 639,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066,654.12 : 1,600,571.58 = 639,139.72 : x
2. Step 2: Convert to fraction form
   1,066,654.12/1,600,571.58 = 639,139.72/x
3. Step 3: Cross multiply
   1,066,654.12x = 1,600,571.58 × 639,139.72
4. Step 4: Simplify right side
   1,066,654.12x = 1,022,988,871,481.16
5. Step 5: Solve for x
   x = 1,022,988,871,481.16/1,066,654.12
6. Step 6: Final answer
   x = 959,063.35