Finding the Fourth Proportional to 1,720.16, 2,373.86 and 1,012.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.16 : 2,373.86 = 1,012.05 : x
2. Step 2: Convert to fraction form
   1,720.16/2,373.86 = 1,012.05/x
3. Step 3: Cross multiply
   1,720.16x = 2,373.86 × 1,012.05
4. Step 4: Simplify right side
   1,720.16x = 2,402,467.54
5. Step 5: Solve for x
   x = 2,402,467.54/1,720.16
6. Step 6: Final answer
   x = 1,396.66