Finding the Fourth Proportional to 8,120.70, 12,171.82 and 3,437.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,120.70 : 12,171.82 = 3,437.78 : x
2. Step 2: Convert to fraction form
   8,120.70/12,171.82 = 3,437.78/x
3. Step 3: Cross multiply
   8,120.70x = 12,171.82 × 3,437.78
4. Step 4: Simplify right side
   8,120.70x = 41,844,061.19
5. Step 5: Solve for x
   x = 41,844,061.19/8,120.70
6. Step 6: Final answer
   x = 5,152.77