Finding the Fourth Proportional to 1,385.60, 1,912.10 and 796.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.60 : 1,912.10 = 796.12 : x
2. Step 2: Convert to fraction form
   1,385.60/1,912.10 = 796.12/x
3. Step 3: Cross multiply
   1,385.60x = 1,912.10 × 796.12
4. Step 4: Simplify right side
   1,385.60x = 1,522,261.05
5. Step 5: Solve for x
   x = 1,522,261.05/1,385.60
6. Step 6: Final answer
   x = 1,098.63