Finding the Fourth Proportional to 1,036,139.78, 1,554,297.12 and 288,185.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036,139.78 : 1,554,297.12 = 288,185.78 : x
2. Step 2: Convert to fraction form
   1,036,139.78/1,554,297.12 = 288,185.78/x
3. Step 3: Cross multiply
   1,036,139.78x = 1,554,297.12 × 288,185.78
4. Step 4: Simplify right side
   1,036,139.78x = 447,926,327,878.95
5. Step 5: Solve for x
   x = 447,926,327,878.95/1,036,139.78
6. Step 6: Final answer
   x = 432,302.99