Finding the Fourth Proportional to 1,715.55, 2,367.50 and 1,007.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.55 : 2,367.50 = 1,007.90 : x
2. Step 2: Convert to fraction form
   1,715.55/2,367.50 = 1,007.90/x
3. Step 3: Cross multiply
   1,715.55x = 2,367.50 × 1,007.90
4. Step 4: Simplify right side
   1,715.55x = 2,386,186.37
5. Step 5: Solve for x
   x = 2,386,186.37/1,715.55
6. Step 6: Final answer
   x = 1,390.92