Finding the Fourth Proportional to 8,784.59, 12,117.60 and 5,198.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,784.59 : 12,117.60 = 5,198.31 : x
2. Step 2: Convert to fraction form
   8,784.59/12,117.60 = 5,198.31/x
3. Step 3: Cross multiply
   8,784.59x = 12,117.60 × 5,198.31
4. Step 4: Simplify right side
   8,784.59x = 62,991,041.26
5. Step 5: Solve for x
   x = 62,991,041.26/8,784.59
6. Step 6: Final answer
   x = 7,170.63