Finding the Fourth Proportional to 1,520.98, 2,097.70 and 931.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.98 : 2,097.70 = 931.10 : x
2. Step 2: Convert to fraction form
   1,520.98/2,097.70 = 931.10/x
3. Step 3: Cross multiply
   1,520.98x = 2,097.70 × 931.10
4. Step 4: Simplify right side
   1,520.98x = 1,953,155.65
5. Step 5: Solve for x
   x = 1,953,155.65/1,520.98
6. Step 6: Final answer
   x = 1,284.15