Finding the Fourth Proportional to 1,312.38, 1,977.56 and 1,086.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.38 : 1,977.56 = 1,086.34 : x
2. Step 2: Convert to fraction form
   1,312.38/1,977.56 = 1,086.34/x
3. Step 3: Cross multiply
   1,312.38x = 1,977.56 × 1,086.34
4. Step 4: Simplify right side
   1,312.38x = 2,148,300.49
5. Step 5: Solve for x
   x = 2,148,300.49/1,312.38
6. Step 6: Final answer
   x = 1,636.95