Finding the Fourth Proportional to 10,915.20, 16,346.88 and 7,787.52

Step by Step Solution

1. Step 1: Write the proportion equation
   10,915.20 : 16,346.88 = 7,787.52 : x
2. Step 2: Convert to fraction form
   10,915.20/16,346.88 = 7,787.52/x
3. Step 3: Cross multiply
   10,915.20x = 16,346.88 × 7,787.52
4. Step 4: Simplify right side
   10,915.20x = 127,301,654.94
5. Step 5: Solve for x
   x = 127,301,654.94/10,915.20
6. Step 6: Final answer
   x = 11,662.79