Finding the Fourth Proportional to 2,111.88, 3,165.60 and 1,137.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.88 : 3,165.60 = 1,137.72 : x
2. Step 2: Convert to fraction form
   2,111.88/3,165.60 = 1,137.72/x
3. Step 3: Cross multiply
   2,111.88x = 3,165.60 × 1,137.72
4. Step 4: Simplify right side
   2,111.88x = 3,601,566.43
5. Step 5: Solve for x
   x = 3,601,566.43/2,111.88
6. Step 6: Final answer
   x = 1,705.38