Finding the Fourth Proportional to 1,007,776.42, 1,511,719.71 and 408,648.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007,776.42 : 1,511,719.71 = 408,648.58 : x
2. Step 2: Convert to fraction form
   1,007,776.42/1,511,719.71 = 408,648.58/x
3. Step 3: Cross multiply
   1,007,776.42x = 1,511,719.71 × 408,648.58
4. Step 4: Simplify right side
   1,007,776.42x = 617,762,112,849.51
5. Step 5: Solve for x
   x = 617,762,112,849.51/1,007,776.42
6. Step 6: Final answer
   x = 612,995.20