Finding the Fourth Proportional to 1,287,196.44, 1,931,106.78 and 388,584.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287,196.44 : 1,931,106.78 = 388,584.52 : x
2. Step 2: Convert to fraction form
   1,287,196.44/1,931,106.78 = 388,584.52/x
3. Step 3: Cross multiply
   1,287,196.44x = 1,931,106.78 × 388,584.52
4. Step 4: Simplify right side
   1,287,196.44x = 750,398,201,175.05
5. Step 5: Solve for x
   x = 750,398,201,175.05/1,287,196.44
6. Step 6: Final answer
   x = 582,971.00