Finding the Fourth Proportional to 8,671.60, 12,981.86 and 5,374.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,671.60 : 12,981.86 = 5,374.10 : x
2. Step 2: Convert to fraction form
   8,671.60/12,981.86 = 5,374.10/x
3. Step 3: Cross multiply
   8,671.60x = 12,981.86 × 5,374.10
4. Step 4: Simplify right side
   8,671.60x = 69,765,813.83
5. Step 5: Solve for x
   x = 69,765,813.83/8,671.60
6. Step 6: Final answer
   x = 8,045.32