Finding the Fourth Proportional to 1,720.72, 2,374.05 and 1,012.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.72 : 2,374.05 = 1,012.34 : x
2. Step 2: Convert to fraction form
   1,720.72/2,374.05 = 1,012.34/x
3. Step 3: Cross multiply
   1,720.72x = 2,374.05 × 1,012.34
4. Step 4: Simplify right side
   1,720.72x = 2,403,345.78
5. Step 5: Solve for x
   x = 2,403,345.78/1,720.72
6. Step 6: Final answer
   x = 1,396.71