Finding the Fourth Proportional to 280,870.69, 387,601.55 and 153,546.28

Step by Step Solution

1. Step 1: Write the proportion equation
   280,870.69 : 387,601.55 = 153,546.28 : x
2. Step 2: Convert to fraction form
   280,870.69/387,601.55 = 153,546.28/x
3. Step 3: Cross multiply
   280,870.69x = 387,601.55 × 153,546.28
4. Step 4: Simplify right side
   280,870.69x = 59,514,778,007.75
5. Step 5: Solve for x
   x = 59,514,778,007.75/280,870.69
6. Step 6: Final answer
   x = 211,893.87