Finding the Fourth Proportional to 1,155.87, 1,595.70 and 714.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.87 : 1,595.70 = 714.15 : x
2. Step 2: Convert to fraction form
   1,155.87/1,595.70 = 714.15/x
3. Step 3: Cross multiply
   1,155.87x = 1,595.70 × 714.15
4. Step 4: Simplify right side
   1,155.87x = 1,139,569.16
5. Step 5: Solve for x
   x = 1,139,569.16/1,155.87
6. Step 6: Final answer
   x = 985.90