Finding the Fourth Proportional to 2,607.76, 3,598.76 and 1,428.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.76 : 3,598.76 = 1,428.80 : x
2. Step 2: Convert to fraction form
   2,607.76/3,598.76 = 1,428.80/x
3. Step 3: Cross multiply
   2,607.76x = 3,598.76 × 1,428.80
4. Step 4: Simplify right side
   2,607.76x = 5,141,908.29
5. Step 5: Solve for x
   x = 5,141,908.29/2,607.76
6. Step 6: Final answer
   x = 1,971.77