Finding the Fourth Proportional to 1,681.25, 2,317.72 and 1,121.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.25 : 2,317.72 = 1,121.51 : x
2. Step 2: Convert to fraction form
   1,681.25/2,317.72 = 1,121.51/x
3. Step 3: Cross multiply
   1,681.25x = 2,317.72 × 1,121.51
4. Step 4: Simplify right side
   1,681.25x = 2,599,349.15
5. Step 5: Solve for x
   x = 2,599,349.15/1,681.25
6. Step 6: Final answer
   x = 1,546.09