Finding the Fourth Proportional to 1,385.70, 1,911.70 and 796.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.70 : 1,911.70 = 796.15 : x
2. Step 2: Convert to fraction form
   1,385.70/1,911.70 = 796.15/x
3. Step 3: Cross multiply
   1,385.70x = 1,911.70 × 796.15
4. Step 4: Simplify right side
   1,385.70x = 1,521,999.96
5. Step 5: Solve for x
   x = 1,521,999.96/1,385.70
6. Step 6: Final answer
   x = 1,098.36