Finding the Fourth Proportional to 2,347.72, 3,521.61 and 1,115.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,347.72 : 3,521.61 = 1,115.25 : x
2. Step 2: Convert to fraction form
   2,347.72/3,521.61 = 1,115.25/x
3. Step 3: Cross multiply
   2,347.72x = 3,521.61 × 1,115.25
4. Step 4: Simplify right side
   2,347.72x = 3,927,482.16
5. Step 5: Solve for x
   x = 3,927,482.16/2,347.72
6. Step 6: Final answer
   x = 1,672.89