Finding the Fourth Proportional to 1,339,066.52, 2,008,675.73 and 428,328.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339,066.52 : 2,008,675.73 = 428,328.98 : x
2. Step 2: Convert to fraction form
   1,339,066.52/2,008,675.73 = 428,328.98/x
3. Step 3: Cross multiply
   1,339,066.52x = 2,008,675.73 × 428,328.98
4. Step 4: Simplify right side
   1,339,066.52x = 860,374,025,141.63
5. Step 5: Solve for x
   x = 860,374,025,141.63/1,339,066.52
6. Step 6: Final answer
   x = 642,517.76