Finding the Fourth Proportional to 1,138,326.56, 1,707,556.56 and 428,360.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138,326.56 : 1,707,556.56 = 428,360.72 : x
2. Step 2: Convert to fraction form
   1,138,326.56/1,707,556.56 = 428,360.72/x
3. Step 3: Cross multiply
   1,138,326.56x = 1,707,556.56 × 428,360.72
4. Step 4: Simplify right side
   1,138,326.56x = 731,450,157,482.32
5. Step 5: Solve for x
   x = 731,450,157,482.32/1,138,326.56
6. Step 6: Final answer
   x = 642,566.19