Finding the Fourth Proportional to 1,147.55, 1,583.62 and 623.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.55 : 1,583.62 = 623.57 : x
2. Step 2: Convert to fraction form
   1,147.55/1,583.62 = 623.57/x
3. Step 3: Cross multiply
   1,147.55x = 1,583.62 × 623.57
4. Step 4: Simplify right side
   1,147.55x = 987,500.32
5. Step 5: Solve for x
   x = 987,500.32/1,147.55
6. Step 6: Final answer
   x = 860.53