Finding the Fourth Proportional to 2,607.81, 3,598.79 and 1,428.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.81 : 3,598.79 = 1,428.88 : x
2. Step 2: Convert to fraction form
   2,607.81/3,598.79 = 1,428.88/x
3. Step 3: Cross multiply
   2,607.81x = 3,598.79 × 1,428.88
4. Step 4: Simplify right side
   2,607.81x = 5,142,239.06
5. Step 5: Solve for x
   x = 5,142,239.06/2,607.81
6. Step 6: Final answer
   x = 1,971.86