Finding the Fourth Proportional to 1,887.51, 2,605.05 and 1,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,887.51 : 2,605.05 = 1,131.31 : x
2. Step 2: Convert to fraction form
   1,887.51/2,605.05 = 1,131.31/x
3. Step 3: Cross multiply
   1,887.51x = 2,605.05 × 1,131.31
4. Step 4: Simplify right side
   1,887.51x = 2,947,112.60
5. Step 5: Solve for x
   x = 2,947,112.60/1,887.51
6. Step 6: Final answer
   x = 1,561.38