Finding the Fourth Proportional to 1,543.86, 2,131.56 and 1,189.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.86 : 2,131.56 = 1,189.15 : x
2. Step 2: Convert to fraction form
   1,543.86/2,131.56 = 1,189.15/x
3. Step 3: Cross multiply
   1,543.86x = 2,131.56 × 1,189.15
4. Step 4: Simplify right side
   1,543.86x = 2,534,739.25
5. Step 5: Solve for x
   x = 2,534,739.25/1,543.86
6. Step 6: Final answer
   x = 1,641.82