Finding the Fourth Proportional to 280,411.89, 386,953.76 and 153,062.88

Step by Step Solution

1. Step 1: Write the proportion equation
   280,411.89 : 386,953.76 = 153,062.88 : x
2. Step 2: Convert to fraction form
   280,411.89/386,953.76 = 153,062.88/x
3. Step 3: Cross multiply
   280,411.89x = 386,953.76 × 153,062.88
4. Step 4: Simplify right side
   280,411.89x = 59,228,256,932.43
5. Step 5: Solve for x
   x = 59,228,256,932.43/280,411.89
6. Step 6: Final answer
   x = 211,218.78