Finding the Fourth Proportional to 280,109.12, 386,555.80 and 152,789.28

Step by Step Solution

1. Step 1: Write the proportion equation
   280,109.12 : 386,555.80 = 152,789.28 : x
2. Step 2: Convert to fraction form
   280,109.12/386,555.80 = 152,789.28/x
3. Step 3: Cross multiply
   280,109.12x = 386,555.80 × 152,789.28
4. Step 4: Simplify right side
   280,109.12x = 59,061,582,361.82
5. Step 5: Solve for x
   x = 59,061,582,361.82/280,109.12
6. Step 6: Final answer
   x = 210,852.05