Finding the Fourth Proportional to 9,811.85, 13,540.70 and 5,620.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,811.85 : 13,540.70 = 5,620.91 : x
2. Step 2: Convert to fraction form
   9,811.85/13,540.70 = 5,620.91/x
3. Step 3: Cross multiply
   9,811.85x = 13,540.70 × 5,620.91
4. Step 4: Simplify right side
   9,811.85x = 76,111,002.39
5. Step 5: Solve for x
   x = 76,111,002.39/9,811.85
6. Step 6: Final answer
   x = 7,757.05