Finding the Fourth Proportional to 20,807.76, 31,209.32 and 5,225.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,807.76 : 31,209.32 = 5,225.42 : x
2. Step 2: Convert to fraction form
   20,807.76/31,209.32 = 5,225.42/x
3. Step 3: Cross multiply
   20,807.76x = 31,209.32 × 5,225.42
4. Step 4: Simplify right side
   20,807.76x = 163,081,804.91
5. Step 5: Solve for x
   x = 163,081,804.91/20,807.76
6. Step 6: Final answer
   x = 7,837.55