Finding the Fourth Proportional to 8,100.77, 12,152.85 and 3,420.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,100.77 : 12,152.85 = 3,420.79 : x
2. Step 2: Convert to fraction form
   8,100.77/12,152.85 = 3,420.79/x
3. Step 3: Cross multiply
   8,100.77x = 12,152.85 × 3,420.79
4. Step 4: Simplify right side
   8,100.77x = 41,572,392.14
5. Step 5: Solve for x
   x = 41,572,392.14/8,100.77
6. Step 6: Final answer
   x = 5,131.91