Finding the Fourth Proportional to 1,381.16, 1,906.41 and 1,101.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.16 : 1,906.41 = 1,101.30 : x
2. Step 2: Convert to fraction form
   1,381.16/1,906.41 = 1,101.30/x
3. Step 3: Cross multiply
   1,381.16x = 1,906.41 × 1,101.30
4. Step 4: Simplify right side
   1,381.16x = 2,099,529.33
5. Step 5: Solve for x
   x = 2,099,529.33/1,381.16
6. Step 6: Final answer
   x = 1,520.13