Finding the Fourth Proportional to 1,242.18, 1,861.89 and 626.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.18 : 1,861.89 = 626.43 : x
2. Step 2: Convert to fraction form
   1,242.18/1,861.89 = 626.43/x
3. Step 3: Cross multiply
   1,242.18x = 1,861.89 × 626.43
4. Step 4: Simplify right side
   1,242.18x = 1,166,343.75
5. Step 5: Solve for x
   x = 1,166,343.75/1,242.18
6. Step 6: Final answer
   x = 938.95