Finding the Fourth Proportional to 9,788.60, 13,499.56 and 7,899.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,788.60 : 13,499.56 = 7,899.58 : x
2. Step 2: Convert to fraction form
   9,788.60/13,499.56 = 7,899.58/x
3. Step 3: Cross multiply
   9,788.60x = 13,499.56 × 7,899.58
4. Step 4: Simplify right side
   9,788.60x = 106,640,805.00
5. Step 5: Solve for x
   x = 106,640,805.00/9,788.60
6. Step 6: Final answer
   x = 10,894.39