Finding the Fourth Proportional to 2,155.80, 2,973.60 and 1,762.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.80 : 2,973.60 = 1,762.20 : x
2. Step 2: Convert to fraction form
   2,155.80/2,973.60 = 1,762.20/x
3. Step 3: Cross multiply
   2,155.80x = 2,973.60 × 1,762.20
4. Step 4: Simplify right side
   2,155.80x = 5,240,077.92
5. Step 5: Solve for x
   x = 5,240,077.92/2,155.80
6. Step 6: Final answer
   x = 2,430.69