Finding the Fourth Proportional to 8,761.42, 13,145.78 and 5,258.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,761.42 : 13,145.78 = 5,258.17 : x
2. Step 2: Convert to fraction form
   8,761.42/13,145.78 = 5,258.17/x
3. Step 3: Cross multiply
   8,761.42x = 13,145.78 × 5,258.17
4. Step 4: Simplify right side
   8,761.42x = 69,122,746.02
5. Step 5: Solve for x
   x = 69,122,746.02/8,761.42
6. Step 6: Final answer
   x = 7,889.45