Finding the Fourth Proportional to 2,140.60, 2,955.69 and 1,642.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.60 : 2,955.69 = 1,642.45 : x
2. Step 2: Convert to fraction form
   2,140.60/2,955.69 = 1,642.45/x
3. Step 3: Cross multiply
   2,140.60x = 2,955.69 × 1,642.45
4. Step 4: Simplify right side
   2,140.60x = 4,854,573.04
5. Step 5: Solve for x
   x = 4,854,573.04/2,140.60
6. Step 6: Final answer
   x = 2,267.86