Finding the Fourth Proportional to 20,820.84, 31,225.39 and 7,491.89

Step by Step Solution

1. Step 1: Write the proportion equation
   20,820.84 : 31,225.39 = 7,491.89 : x
2. Step 2: Convert to fraction form
   20,820.84/31,225.39 = 7,491.89/x
3. Step 3: Cross multiply
   20,820.84x = 31,225.39 × 7,491.89
4. Step 4: Simplify right side
   20,820.84x = 233,937,012.23
5. Step 5: Solve for x
   x = 233,937,012.23/20,820.84
6. Step 6: Final answer
   x = 11,235.71