Finding the Fourth Proportional to 31,420.72, 43,356.40 and 19,479.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,420.72 : 43,356.40 = 19,479.72 : x
2. Step 2: Convert to fraction form
   31,420.72/43,356.40 = 19,479.72/x
3. Step 3: Cross multiply
   31,420.72x = 43,356.40 × 19,479.72
4. Step 4: Simplify right side
   31,420.72x = 844,570,532.21
5. Step 5: Solve for x
   x = 844,570,532.21/31,420.72
6. Step 6: Final answer
   x = 26,879.41