Finding the Fourth Proportional to 280,002.42, 386,411.31 and 152,685

Step by Step Solution

1. Step 1: Write the proportion equation
   280,002.42 : 386,411.31 = 152,685 : x
2. Step 2: Convert to fraction form
   280,002.42/386,411.31 = 152,685/x
3. Step 3: Cross multiply
   280,002.42x = 386,411.31 × 152,685
4. Step 4: Simplify right side
   280,002.42x = 58,999,210,867.35
5. Step 5: Solve for x
   x = 58,999,210,867.35/280,002.42
6. Step 6: Final answer
   x = 210,709.65