Finding the Fourth Proportional to 8,958.60, 12,363.98 and 5,421.74

Step by Step Solution

1. Step 1: Write the proportion equation
   8,958.60 : 12,363.98 = 5,421.74 : x
2. Step 2: Convert to fraction form
   8,958.60/12,363.98 = 5,421.74/x
3. Step 3: Cross multiply
   8,958.60x = 12,363.98 × 5,421.74
4. Step 4: Simplify right side
   8,958.60x = 67,034,196.00
5. Step 5: Solve for x
   x = 67,034,196.00/8,958.60
6. Step 6: Final answer
   x = 7,482.66