Finding the Fourth Proportional to 31,363.50, 43,289.92 and 19,420.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,363.50 : 43,289.92 = 19,420.05 : x
2. Step 2: Convert to fraction form
   31,363.50/43,289.92 = 19,420.05/x
3. Step 3: Cross multiply
   31,363.50x = 43,289.92 × 19,420.05
4. Step 4: Simplify right side
   31,363.50x = 840,692,272.83
5. Step 5: Solve for x
   x = 840,692,272.83/31,363.50
6. Step 6: Final answer
   x = 26,804.80