Finding the Fourth Proportional to 2,435.67, 3,656.09 and 1,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,435.67 : 3,656.09 = 1,978.96 : x
2. Step 2: Convert to fraction form
   2,435.67/3,656.09 = 1,978.96/x
3. Step 3: Cross multiply
   2,435.67x = 3,656.09 × 1,978.96
4. Step 4: Simplify right side
   2,435.67x = 7,235,243.69
5. Step 5: Solve for x
   x = 7,235,243.69/2,435.67
6. Step 6: Final answer
   x = 2,970.54