Finding the Fourth Proportional to 2,109.31, 2,911.66 and 1,887.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.31 : 2,911.66 = 1,887.87 : x
2. Step 2: Convert to fraction form
   2,109.31/2,911.66 = 1,887.87/x
3. Step 3: Cross multiply
   2,109.31x = 2,911.66 × 1,887.87
4. Step 4: Simplify right side
   2,109.31x = 5,496,835.56
5. Step 5: Solve for x
   x = 5,496,835.56/2,109.31
6. Step 6: Final answer
   x = 2,605.99