Finding the Fourth Proportional to 1,381.11, 2,061.59 and 1,279.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.11 : 2,061.59 = 1,279.59 : x
2. Step 2: Convert to fraction form
   1,381.11/2,061.59 = 1,279.59/x
3. Step 3: Cross multiply
   1,381.11x = 2,061.59 × 1,279.59
4. Step 4: Simplify right side
   1,381.11x = 2,637,989.95
5. Step 5: Solve for x
   x = 2,637,989.95/1,381.11
6. Step 6: Final answer
   x = 1,910.05