Finding the Fourth Proportional to 31,620.15, 43,656.15 and 20,294.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,620.15 : 43,656.15 = 20,294.53 : x
2. Step 2: Convert to fraction form
   31,620.15/43,656.15 = 20,294.53/x
3. Step 3: Cross multiply
   31,620.15x = 43,656.15 × 20,294.53
4. Step 4: Simplify right side
   31,620.15x = 885,981,045.86
5. Step 5: Solve for x
   x = 885,981,045.86/31,620.15
6. Step 6: Final answer
   x = 28,019.51