Finding the Fourth Proportional to 31,412, 43,345.86 and 18,489.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,412 : 43,345.86 = 18,489.91 : x
2. Step 2: Convert to fraction form
   31,412/43,345.86 = 18,489.91/x
3. Step 3: Cross multiply
   31,412x = 43,345.86 × 18,489.91
4. Step 4: Simplify right side
   31,412x = 801,461,050.27
5. Step 5: Solve for x
   x = 801,461,050.27/31,412
6. Step 6: Final answer
   x = 25,514.49