Finding the Fourth Proportional to 3,618.56, 5,428.67 and 1,310.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,618.56 : 5,428.67 = 1,310.06 : x
2. Step 2: Convert to fraction form
   3,618.56/5,428.67 = 1,310.06/x
3. Step 3: Cross multiply
   3,618.56x = 5,428.67 × 1,310.06
4. Step 4: Simplify right side
   3,618.56x = 7,111,883.42
5. Step 5: Solve for x
   x = 7,111,883.42/3,618.56
6. Step 6: Final answer
   x = 1,965.39