Finding the Fourth Proportional to 9,036.10, 12,455.40 and 7,621.84

Step by Step Solution

1. Step 1: Write the proportion equation
   9,036.10 : 12,455.40 = 7,621.84 : x
2. Step 2: Convert to fraction form
   9,036.10/12,455.40 = 7,621.84/x
3. Step 3: Cross multiply
   9,036.10x = 12,455.40 × 7,621.84
4. Step 4: Simplify right side
   9,036.10x = 94,933,065.94
5. Step 5: Solve for x
   x = 94,933,065.94/9,036.10
6. Step 6: Final answer
   x = 10,505.98