Finding the Fourth Proportional to 2,715.31, 4,071.52 and 1,328.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.31 : 4,071.52 = 1,328.89 : x
2. Step 2: Convert to fraction form
   2,715.31/4,071.52 = 1,328.89/x
3. Step 3: Cross multiply
   2,715.31x = 4,071.52 × 1,328.89
4. Step 4: Simplify right side
   2,715.31x = 5,410,602.21
5. Step 5: Solve for x
   x = 5,410,602.21/2,715.31
6. Step 6: Final answer
   x = 1,992.63