Finding the Fourth Proportional to 1,642.38, 2,457.42 and 912.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.38 : 2,457.42 = 912.47 : x
2. Step 2: Convert to fraction form
   1,642.38/2,457.42 = 912.47/x
3. Step 3: Cross multiply
   1,642.38x = 2,457.42 × 912.47
4. Step 4: Simplify right side
   1,642.38x = 2,242,322.03
5. Step 5: Solve for x
   x = 2,242,322.03/1,642.38
6. Step 6: Final answer
   x = 1,365.29