Finding the Fourth Proportional to 2,607.12, 3,597.70 and 1,428.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.12 : 3,597.70 = 1,428.16 : x
2. Step 2: Convert to fraction form
   2,607.12/3,597.70 = 1,428.16/x
3. Step 3: Cross multiply
   2,607.12x = 3,597.70 × 1,428.16
4. Step 4: Simplify right side
   2,607.12x = 5,138,091.23
5. Step 5: Solve for x
   x = 5,138,091.23/2,607.12
6. Step 6: Final answer
   x = 1,970.80