Finding the Fourth Proportional to 1,147.61, 1,583.69 and 623.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.61 : 1,583.69 = 623.63 : x
2. Step 2: Convert to fraction form
   1,147.61/1,583.69 = 623.63/x
3. Step 3: Cross multiply
   1,147.61x = 1,583.69 × 623.63
4. Step 4: Simplify right side
   1,147.61x = 987,625.56
5. Step 5: Solve for x
   x = 987,625.56/1,147.61
6. Step 6: Final answer
   x = 860.60