Finding the Fourth Proportional to 8,499.78, 11,700.59 and 7,374.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.78 : 11,700.59 = 7,374.09 : x
2. Step 2: Convert to fraction form
   8,499.78/11,700.59 = 7,374.09/x
3. Step 3: Cross multiply
   8,499.78x = 11,700.59 × 7,374.09
4. Step 4: Simplify right side
   8,499.78x = 86,281,166.84
5. Step 5: Solve for x
   x = 86,281,166.84/8,499.78
6. Step 6: Final answer
   x = 10,150.99