Finding the Fourth Proportional to 8,701.78, 12,018.42 and 5,730.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,701.78 : 12,018.42 = 5,730.89 : x
2. Step 2: Convert to fraction form
   8,701.78/12,018.42 = 5,730.89/x
3. Step 3: Cross multiply
   8,701.78x = 12,018.42 × 5,730.89
4. Step 4: Simplify right side
   8,701.78x = 68,876,242.99
5. Step 5: Solve for x
   x = 68,876,242.99/8,701.78
6. Step 6: Final answer
   x = 7,915.19