Finding the Fourth Proportional to 2,130.80, 3,196.34 and 670.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.80 : 3,196.34 = 670.05 : x
2. Step 2: Convert to fraction form
   2,130.80/3,196.34 = 670.05/x
3. Step 3: Cross multiply
   2,130.80x = 3,196.34 × 670.05
4. Step 4: Simplify right side
   2,130.80x = 2,141,704.27
5. Step 5: Solve for x
   x = 2,141,704.27/2,130.80
6. Step 6: Final answer
   x = 1,005.12