Finding the Fourth Proportional to 1,720.10, 2,373.72 and 934.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.10 : 2,373.72 = 934.15 : x
2. Step 2: Convert to fraction form
   1,720.10/2,373.72 = 934.15/x
3. Step 3: Cross multiply
   1,720.10x = 2,373.72 × 934.15
4. Step 4: Simplify right side
   1,720.10x = 2,217,410.54
5. Step 5: Solve for x
   x = 2,217,410.54/1,720.10
6. Step 6: Final answer
   x = 1,289.12