Finding the Fourth Proportional to 31,437.91, 43,406.54 and 20,849.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,437.91 : 43,406.54 = 20,849.59 : x
2. Step 2: Convert to fraction form
   31,437.91/43,406.54 = 20,849.59/x
3. Step 3: Cross multiply
   31,437.91x = 43,406.54 × 20,849.59
4. Step 4: Simplify right side
   31,437.91x = 905,008,562.32
5. Step 5: Solve for x
   x = 905,008,562.32/31,437.91
6. Step 6: Final answer
   x = 28,787.17