Finding the Fourth Proportional to 1,720.91, 2,374.72 and 974.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.91 : 2,374.72 = 974.70 : x
2. Step 2: Convert to fraction form
   1,720.91/2,374.72 = 974.70/x
3. Step 3: Cross multiply
   1,720.91x = 2,374.72 × 974.70
4. Step 4: Simplify right side
   1,720.91x = 2,314,637.15
5. Step 5: Solve for x
   x = 2,314,637.15/1,720.91
6. Step 6: Final answer
   x = 1,345.01