Finding the Fourth Proportional to 2,171.50, 2,995.96 and 1,385.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.50 : 2,995.96 = 1,385.80 : x
2. Step 2: Convert to fraction form
   2,171.50/2,995.96 = 1,385.80/x
3. Step 3: Cross multiply
   2,171.50x = 2,995.96 × 1,385.80
4. Step 4: Simplify right side
   2,171.50x = 4,151,801.37
5. Step 5: Solve for x
   x = 4,151,801.37/2,171.50
6. Step 6: Final answer
   x = 1,911.95