Finding the Fourth Proportional to 12,290.76, 18,430.38 and 4,077

Step by Step Solution

1. Step 1: Write the proportion equation
   12,290.76 : 18,430.38 = 4,077 : x
2. Step 2: Convert to fraction form
   12,290.76/18,430.38 = 4,077/x
3. Step 3: Cross multiply
   12,290.76x = 18,430.38 × 4,077
4. Step 4: Simplify right side
   12,290.76x = 75,140,659.26
5. Step 5: Solve for x
   x = 75,140,659.26/12,290.76
6. Step 6: Final answer
   x = 6,113.59