Finding the Fourth Proportional to 9,787.89, 13,507.16 and 5,311.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,787.89 : 13,507.16 = 5,311.60 : x
2. Step 2: Convert to fraction form
   9,787.89/13,507.16 = 5,311.60/x
3. Step 3: Cross multiply
   9,787.89x = 13,507.16 × 5,311.60
4. Step 4: Simplify right side
   9,787.89x = 71,744,631.06
5. Step 5: Solve for x
   x = 71,744,631.06/9,787.89
6. Step 6: Final answer
   x = 7,329.94