Finding the Fourth Proportional to 40,478.86, 60,725.31 and 12,398.25

Step by Step Solution

1. Step 1: Write the proportion equation
   40,478.86 : 60,725.31 = 12,398.25 : x
2. Step 2: Convert to fraction form
   40,478.86/60,725.31 = 12,398.25/x
3. Step 3: Cross multiply
   40,478.86x = 60,725.31 × 12,398.25
4. Step 4: Simplify right side
   40,478.86x = 752,887,574.71
5. Step 5: Solve for x
   x = 752,887,574.71/40,478.86
6. Step 6: Final answer
   x = 18,599.53