Finding the Fourth Proportional to 1,139,469.16, 1,707,998.46 and 429,189.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,469.16 : 1,707,998.46 = 429,189.88 : x
2. Step 2: Convert to fraction form
   1,139,469.16/1,707,998.46 = 429,189.88/x
3. Step 3: Cross multiply
   1,139,469.16x = 1,707,998.46 × 429,189.88
4. Step 4: Simplify right side
   1,139,469.16x = 733,055,654,087.59
5. Step 5: Solve for x
   x = 733,055,654,087.59/1,139,469.16
6. Step 6: Final answer
   x = 643,330.84