Finding the Fourth Proportional to 1,147.56, 1,583.61 and 623.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.56 : 1,583.61 = 623.58 : x
2. Step 2: Convert to fraction form
   1,147.56/1,583.61 = 623.58/x
3. Step 3: Cross multiply
   1,147.56x = 1,583.61 × 623.58
4. Step 4: Simplify right side
   1,147.56x = 987,507.52
5. Step 5: Solve for x
   x = 987,507.52/1,147.56
6. Step 6: Final answer
   x = 860.53