Finding the Fourth Proportional to 8,911.50, 12,298.50 and 5,374.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.50 : 12,298.50 = 5,374.50 : x
2. Step 2: Convert to fraction form
   8,911.50/12,298.50 = 5,374.50/x
3. Step 3: Cross multiply
   8,911.50x = 12,298.50 × 5,374.50
4. Step 4: Simplify right side
   8,911.50x = 66,098,288.25
5. Step 5: Solve for x
   x = 66,098,288.25/8,911.50
6. Step 6: Final answer
   x = 7,417.19