Finding the Fourth Proportional to 8,777.45, 12,111.98 and 5,240.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,777.45 : 12,111.98 = 5,240.18 : x
2. Step 2: Convert to fraction form
   8,777.45/12,111.98 = 5,240.18/x
3. Step 3: Cross multiply
   8,777.45x = 12,111.98 × 5,240.18
4. Step 4: Simplify right side
   8,777.45x = 63,468,868.60
5. Step 5: Solve for x
   x = 63,468,868.60/8,777.45
6. Step 6: Final answer
   x = 7,230.90