Finding the Fourth Proportional to 31,390.59, 43,300.94 and 18,808.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,390.59 : 43,300.94 = 18,808.05 : x
2. Step 2: Convert to fraction form
   31,390.59/43,300.94 = 18,808.05/x
3. Step 3: Cross multiply
   31,390.59x = 43,300.94 × 18,808.05
4. Step 4: Simplify right side
   31,390.59x = 814,406,150.53
5. Step 5: Solve for x
   x = 814,406,150.53/31,390.59
6. Step 6: Final answer
   x = 25,944.28