Finding the Fourth Proportional to 1,980.21, 2,732.18 and 1,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.21 : 2,732.18 = 1,140.72 : x
2. Step 2: Convert to fraction form
   1,980.21/2,732.18 = 1,140.72/x
3. Step 3: Cross multiply
   1,980.21x = 2,732.18 × 1,140.72
4. Step 4: Simplify right side
   1,980.21x = 3,116,646.67
5. Step 5: Solve for x
   x = 3,116,646.67/1,980.21
6. Step 6: Final answer
   x = 1,573.90