Finding the Fourth Proportional to 8,778.79, 12,117.86 and 5,242.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,778.79 : 12,117.86 = 5,242.03 : x
2. Step 2: Convert to fraction form
   8,778.79/12,117.86 = 5,242.03/x
3. Step 3: Cross multiply
   8,778.79x = 12,117.86 × 5,242.03
4. Step 4: Simplify right side
   8,778.79x = 63,522,185.66
5. Step 5: Solve for x
   x = 63,522,185.66/8,778.79
6. Step 6: Final answer
   x = 7,235.87