Finding the Fourth Proportional to 280,090.58, 386,524.77 and 152,765.78

Step by Step Solution

1. Step 1: Write the proportion equation
   280,090.58 : 386,524.77 = 152,765.78 : x
2. Step 2: Convert to fraction form
   280,090.58/386,524.77 = 152,765.78/x
3. Step 3: Cross multiply
   280,090.58x = 386,524.77 × 152,765.78
4. Step 4: Simplify right side
   280,090.58x = 59,047,757,978.37
5. Step 5: Solve for x
   x = 59,047,757,978.37/280,090.58
6. Step 6: Final answer
   x = 210,816.65