Finding the Fourth Proportional to 31,273.42, 46,909.90 and 12,540.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,273.42 : 46,909.90 = 12,540.05 : x
2. Step 2: Convert to fraction form
   31,273.42/46,909.90 = 12,540.05/x
3. Step 3: Cross multiply
   31,273.42x = 46,909.90 × 12,540.05
4. Step 4: Simplify right side
   31,273.42x = 588,252,593.53
5. Step 5: Solve for x
   x = 588,252,593.53/31,273.42
6. Step 6: Final answer
   x = 18,809.99