Finding the Fourth Proportional to 1,100.91, 1,648.17 and 856.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.91 : 1,648.17 = 856.70 : x
2. Step 2: Convert to fraction form
   1,100.91/1,648.17 = 856.70/x
3. Step 3: Cross multiply
   1,100.91x = 1,648.17 × 856.70
4. Step 4: Simplify right side
   1,100.91x = 1,411,985.18
5. Step 5: Solve for x
   x = 1,411,985.18/1,100.91
6. Step 6: Final answer
   x = 1,282.56