Finding the Fourth Proportional to 28,300.67, 39,055.28 and 15,555.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,300.67 : 39,055.28 = 15,555.25 : x
2. Step 2: Convert to fraction form
   28,300.67/39,055.28 = 15,555.25/x
3. Step 3: Cross multiply
   28,300.67x = 39,055.28 × 15,555.25
4. Step 4: Simplify right side
   28,300.67x = 607,514,585.47
5. Step 5: Solve for x
   x = 607,514,585.47/28,300.67
6. Step 6: Final answer
   x = 21,466.44