Finding the Fourth Proportional to 280,128.27, 386,578.22 and 152,806.60

Step by Step Solution

1. Step 1: Write the proportion equation
   280,128.27 : 386,578.22 = 152,806.60 : x
2. Step 2: Convert to fraction form
   280,128.27/386,578.22 = 152,806.60/x
3. Step 3: Cross multiply
   280,128.27x = 386,578.22 × 152,806.60
4. Step 4: Simplify right side
   280,128.27x = 59,071,704,010.98
5. Step 5: Solve for x
   x = 59,071,704,010.98/280,128.27
6. Step 6: Final answer
   x = 210,873.77