Finding the Fourth Proportional to 2,015.18, 2,780.63 and 1,130.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.18 : 2,780.63 = 1,130.86 : x
2. Step 2: Convert to fraction form
   2,015.18/2,780.63 = 1,130.86/x
3. Step 3: Cross multiply
   2,015.18x = 2,780.63 × 1,130.86
4. Step 4: Simplify right side
   2,015.18x = 3,144,505.30
5. Step 5: Solve for x
   x = 3,144,505.30/2,015.18
6. Step 6: Final answer
   x = 1,560.41