Finding the Fourth Proportional to 1,715.31, 2,369.70 and 1,618.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.31 : 2,369.70 = 1,618.11 : x
2. Step 2: Convert to fraction form
   1,715.31/2,369.70 = 1,618.11/x
3. Step 3: Cross multiply
   1,715.31x = 2,369.70 × 1,618.11
4. Step 4: Simplify right side
   1,715.31x = 3,834,435.27
5. Step 5: Solve for x
   x = 3,834,435.27/1,715.31
6. Step 6: Final answer
   x = 2,235.42