Finding the Fourth Proportional to 31,648.72, 43,656.96 and 20,470.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,648.72 : 43,656.96 = 20,470.72 : x
2. Step 2: Convert to fraction form
   31,648.72/43,656.96 = 20,470.72/x
3. Step 3: Cross multiply
   31,648.72x = 43,656.96 × 20,470.72
4. Step 4: Simplify right side
   31,648.72x = 893,689,404.21
5. Step 5: Solve for x
   x = 893,689,404.21/31,648.72
6. Step 6: Final answer
   x = 28,237.77