Finding the Fourth Proportional to 1,978.65, 2,969.01 and 1,435.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.65 : 2,969.01 = 1,435.32 : x
2. Step 2: Convert to fraction form
   1,978.65/2,969.01 = 1,435.32/x
3. Step 3: Cross multiply
   1,978.65x = 2,969.01 × 1,435.32
4. Step 4: Simplify right side
   1,978.65x = 4,261,457.41
5. Step 5: Solve for x
   x = 4,261,457.41/1,978.65
6. Step 6: Final answer
   x = 2,153.72