Finding the Fourth Proportional to 2,607.74, 3,598.68 and 1,428.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.74 : 3,598.68 = 1,428.80 : x
2. Step 2: Convert to fraction form
   2,607.74/3,598.68 = 1,428.80/x
3. Step 3: Cross multiply
   2,607.74x = 3,598.68 × 1,428.80
4. Step 4: Simplify right side
   2,607.74x = 5,141,793.98
5. Step 5: Solve for x
   x = 5,141,793.98/2,607.74
6. Step 6: Final answer
   x = 1,971.74