Finding the Fourth Proportional to 2,172.43, 2,996.94 and 1,385.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.43 : 2,996.94 = 1,385.98 : x
2. Step 2: Convert to fraction form
   2,172.43/2,996.94 = 1,385.98/x
3. Step 3: Cross multiply
   2,172.43x = 2,996.94 × 1,385.98
4. Step 4: Simplify right side
   2,172.43x = 4,153,698.90
5. Step 5: Solve for x
   x = 4,153,698.90/2,172.43
6. Step 6: Final answer
   x = 1,912.01