Finding the Fourth Proportional to 1,153.60, 1,590.72 and 687.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.60 : 1,590.72 = 687.52 : x
2. Step 2: Convert to fraction form
   1,153.60/1,590.72 = 687.52/x
3. Step 3: Cross multiply
   1,153.60x = 1,590.72 × 687.52
4. Step 4: Simplify right side
   1,153.60x = 1,093,651.81
5. Step 5: Solve for x
   x = 1,093,651.81/1,153.60
6. Step 6: Final answer
   x = 948.03