Finding the Fourth Proportional to 31,365.31, 43,292.43 and 19,421.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,365.31 : 43,292.43 = 19,421.86 : x
2. Step 2: Convert to fraction form
   31,365.31/43,292.43 = 19,421.86/x
3. Step 3: Cross multiply
   31,365.31x = 43,292.43 × 19,421.86
4. Step 4: Simplify right side
   31,365.31x = 840,819,417.41
5. Step 5: Solve for x
   x = 840,819,417.41/31,365.31
6. Step 6: Final answer
   x = 26,807.30