Finding the Fourth Proportional to 1,313.10, 1,812.06 and 715.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,313.10 : 1,812.06 = 715.59 : x
2. Step 2: Convert to fraction form
   1,313.10/1,812.06 = 715.59/x
3. Step 3: Cross multiply
   1,313.10x = 1,812.06 × 715.59
4. Step 4: Simplify right side
   1,313.10x = 1,296,692.02
5. Step 5: Solve for x
   x = 1,296,692.02/1,313.10
6. Step 6: Final answer
   x = 987.50