Finding the Fourth Proportional to 2,820.02, 3,892.43 and 1,980.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.02 : 3,892.43 = 1,980.92 : x
2. Step 2: Convert to fraction form
   2,820.02/3,892.43 = 1,980.92/x
3. Step 3: Cross multiply
   2,820.02x = 3,892.43 × 1,980.92
4. Step 4: Simplify right side
   2,820.02x = 7,710,563.07
5. Step 5: Solve for x
   x = 7,710,563.07/2,820.02
6. Step 6: Final answer
   x = 2,734.23