Finding the Fourth Proportional to 280,308.81, 386,820.76 and 152,985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   280,308.81 : 386,820.76 = 152,985.31 : x
2. Step 2: Convert to fraction form
   280,308.81/386,820.76 = 152,985.31/x
3. Step 3: Cross multiply
   280,308.81x = 386,820.76 × 152,985.31
4. Step 4: Simplify right side
   280,308.81x = 59,177,893,883.04
5. Step 5: Solve for x
   x = 59,177,893,883.04/280,308.81
6. Step 6: Final answer
   x = 211,116.78