Finding the Fourth Proportional to 1,240.72, 1,861.38 and 876.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.72 : 1,861.38 = 876.22 : x
2. Step 2: Convert to fraction form
   1,240.72/1,861.38 = 876.22/x
3. Step 3: Cross multiply
   1,240.72x = 1,861.38 × 876.22
4. Step 4: Simplify right side
   1,240.72x = 1,630,978.38
5. Step 5: Solve for x
   x = 1,630,978.38/1,240.72
6. Step 6: Final answer
   x = 1,314.54