Finding the Fourth Proportional to 2,120.18, 3,174.83 and 1,387.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.18 : 3,174.83 = 1,387.62 : x
2. Step 2: Convert to fraction form
   2,120.18/3,174.83 = 1,387.62/x
3. Step 3: Cross multiply
   2,120.18x = 3,174.83 × 1,387.62
4. Step 4: Simplify right side
   2,120.18x = 4,405,457.60
5. Step 5: Solve for x
   x = 4,405,457.60/2,120.18
6. Step 6: Final answer
   x = 2,077.87