Finding the Fourth Proportional to 1,562.90, 2,160.07 and 1,189.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.90 : 2,160.07 = 1,189.89 : x
2. Step 2: Convert to fraction form
   1,562.90/2,160.07 = 1,189.89/x
3. Step 3: Cross multiply
   1,562.90x = 2,160.07 × 1,189.89
4. Step 4: Simplify right side
   1,562.90x = 2,570,242.72
5. Step 5: Solve for x
   x = 2,570,242.72/1,562.90
6. Step 6: Final answer
   x = 1,644.54