Finding the Fourth Proportional to 1,144,661.30, 1,717,769.55 and 639,221.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144,661.30 : 1,717,769.55 = 639,221.30 : x
2. Step 2: Convert to fraction form
   1,144,661.30/1,717,769.55 = 639,221.30/x
3. Step 3: Cross multiply
   1,144,661.30x = 1,717,769.55 × 639,221.30
4. Step 4: Simplify right side
   1,144,661.30x = 1,098,034,884,851.42
5. Step 5: Solve for x
   x = 1,098,034,884,851.42/1,144,661.30
6. Step 6: Final answer
   x = 959,266.19