Finding the Fourth Proportional to 8,911.61, 12,297.74 and 5,134.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.61 : 12,297.74 = 5,134.79 : x
2. Step 2: Convert to fraction form
   8,911.61/12,297.74 = 5,134.79/x
3. Step 3: Cross multiply
   8,911.61x = 12,297.74 × 5,134.79
4. Step 4: Simplify right side
   8,911.61x = 63,146,263.72
5. Step 5: Solve for x
   x = 63,146,263.72/8,911.61
6. Step 6: Final answer
   x = 7,085.84