Finding the Fourth Proportional to 1,555.74, 2,149.74 and 1,520.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.74 : 2,149.74 = 1,520.10 : x
2. Step 2: Convert to fraction form
   1,555.74/2,149.74 = 1,520.10/x
3. Step 3: Cross multiply
   1,555.74x = 2,149.74 × 1,520.10
4. Step 4: Simplify right side
   1,555.74x = 3,267,819.77
5. Step 5: Solve for x
   x = 3,267,819.77/1,555.74
6. Step 6: Final answer
   x = 2,100.49