Finding the Fourth Proportional to 2,476.50, 3,417.60 and 1,428.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,476.50 : 3,417.60 = 1,428.78 : x
2. Step 2: Convert to fraction form
   2,476.50/3,417.60 = 1,428.78/x
3. Step 3: Cross multiply
   2,476.50x = 3,417.60 × 1,428.78
4. Step 4: Simplify right side
   2,476.50x = 4,882,998.53
5. Step 5: Solve for x
   x = 4,882,998.53/2,476.50
6. Step 6: Final answer
   x = 1,971.73