Finding the Fourth Proportional to 2,131.56, 3,199.50 and 1,515.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.56 : 3,199.50 = 1,515.96 : x
2. Step 2: Convert to fraction form
   2,131.56/3,199.50 = 1,515.96/x
3. Step 3: Cross multiply
   2,131.56x = 3,199.50 × 1,515.96
4. Step 4: Simplify right side
   2,131.56x = 4,850,314.02
5. Step 5: Solve for x
   x = 4,850,314.02/2,131.56
6. Step 6: Final answer
   x = 2,275.48