Finding the Fourth Proportional to 1,642.17, 2,265.42 and 1,111.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.17 : 2,265.42 = 1,111.25 : x
2. Step 2: Convert to fraction form
   1,642.17/2,265.42 = 1,111.25/x
3. Step 3: Cross multiply
   1,642.17x = 2,265.42 × 1,111.25
4. Step 4: Simplify right side
   1,642.17x = 2,517,436.65
5. Step 5: Solve for x
   x = 2,517,436.65/1,642.17
6. Step 6: Final answer
   x = 1,532.99