Finding the Fourth Proportional to 31,405.70, 43,322.56 and 19,899.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,405.70 : 43,322.56 = 19,899.56 : x
2. Step 2: Convert to fraction form
   31,405.70/43,322.56 = 19,899.56/x
3. Step 3: Cross multiply
   31,405.70x = 43,322.56 × 19,899.56
4. Step 4: Simplify right side
   31,405.70x = 862,099,615.71
5. Step 5: Solve for x
   x = 862,099,615.71/31,405.70
6. Step 6: Final answer
   x = 27,450.42