Finding the Fourth Proportional to 1,912.86, 2,870.46 and 1,092.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.86 : 2,870.46 = 1,092.06 : x
2. Step 2: Convert to fraction form
   1,912.86/2,870.46 = 1,092.06/x
3. Step 3: Cross multiply
   1,912.86x = 2,870.46 × 1,092.06
4. Step 4: Simplify right side
   1,912.86x = 3,134,714.55
5. Step 5: Solve for x
   x = 3,134,714.55/1,912.86
6. Step 6: Final answer
   x = 1,638.76