Finding the Fourth Proportional to 2,171.19, 2,996.70 and 1,385.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.19 : 2,996.70 = 1,385.10 : x
2. Step 2: Convert to fraction form
   2,171.19/2,996.70 = 1,385.10/x
3. Step 3: Cross multiply
   2,171.19x = 2,996.70 × 1,385.10
4. Step 4: Simplify right side
   2,171.19x = 4,150,729.17
5. Step 5: Solve for x
   x = 4,150,729.17/2,171.19
6. Step 6: Final answer
   x = 1,911.73