Finding the Fourth Proportional to 1,127.48, 1,555.83 and 623.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.48 : 1,555.83 = 623.30 : x
2. Step 2: Convert to fraction form
   1,127.48/1,555.83 = 623.30/x
3. Step 3: Cross multiply
   1,127.48x = 1,555.83 × 623.30
4. Step 4: Simplify right side
   1,127.48x = 969,741.06
5. Step 5: Solve for x
   x = 969,741.06/1,127.48
6. Step 6: Final answer
   x = 860.10