Finding the Fourth Proportional to 1,680.94, 2,518.57 and 1,191.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.94 : 2,518.57 = 1,191.57 : x
2. Step 2: Convert to fraction form
   1,680.94/2,518.57 = 1,191.57/x
3. Step 3: Cross multiply
   1,680.94x = 2,518.57 × 1,191.57
4. Step 4: Simplify right side
   1,680.94x = 3,001,052.45
5. Step 5: Solve for x
   x = 3,001,052.45/1,680.94
6. Step 6: Final answer
   x = 1,785.34