Finding the Fourth Proportional to 8,778.42, 12,111.93 and 5,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,778.42 : 12,111.93 = 5,242.50 : x
2. Step 2: Convert to fraction form
   8,778.42/12,111.93 = 5,242.50/x
3. Step 3: Cross multiply
   8,778.42x = 12,111.93 × 5,242.50
4. Step 4: Simplify right side
   8,778.42x = 63,496,793.03
5. Step 5: Solve for x
   x = 63,496,793.03/8,778.42
6. Step 6: Final answer
   x = 7,233.28