Finding the Fourth Proportional to 1,642.69, 2,459.73 and 1,312.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.69 : 2,459.73 = 1,312.11 : x
2. Step 2: Convert to fraction form
   1,642.69/2,459.73 = 1,312.11/x
3. Step 3: Cross multiply
   1,642.69x = 2,459.73 × 1,312.11
4. Step 4: Simplify right side
   1,642.69x = 3,227,441.25
5. Step 5: Solve for x
   x = 3,227,441.25/1,642.69
6. Step 6: Final answer
   x = 1,964.73