Finding the Fourth Proportional to 2,715.67, 4,070.31 and 1,155.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.67 : 4,070.31 = 1,155.21 : x
2. Step 2: Convert to fraction form
   2,715.67/4,070.31 = 1,155.21/x
3. Step 3: Cross multiply
   2,715.67x = 4,070.31 × 1,155.21
4. Step 4: Simplify right side
   2,715.67x = 4,702,042.46
5. Step 5: Solve for x
   x = 4,702,042.46/2,715.67
6. Step 6: Final answer
   x = 1,731.45