Finding the Fourth Proportional to 9,789.34, 13,509.31 and 5,811.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,789.34 : 13,509.31 = 5,811.25 : x
2. Step 2: Convert to fraction form
   9,789.34/13,509.31 = 5,811.25/x
3. Step 3: Cross multiply
   9,789.34x = 13,509.31 × 5,811.25
4. Step 4: Simplify right side
   9,789.34x = 78,506,001.89
5. Step 5: Solve for x
   x = 78,506,001.89/9,789.34
6. Step 6: Final answer
   x = 8,019.54