Finding the Fourth Proportional to 1,520.10, 2,097.90 and 931.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.10 : 2,097.90 = 931.02 : x
2. Step 2: Convert to fraction form
   1,520.10/2,097.90 = 931.02/x
3. Step 3: Cross multiply
   1,520.10x = 2,097.90 × 931.02
4. Step 4: Simplify right side
   1,520.10x = 1,953,186.86
5. Step 5: Solve for x
   x = 1,953,186.86/1,520.10
6. Step 6: Final answer
   x = 1,284.91