Finding the Fourth Proportional to 1,561.69, 2,343.38 and 637.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.69 : 2,343.38 = 637.89 : x
2. Step 2: Convert to fraction form
   1,561.69/2,343.38 = 637.89/x
3. Step 3: Cross multiply
   1,561.69x = 2,343.38 × 637.89
4. Step 4: Simplify right side
   1,561.69x = 1,494,818.67
5. Step 5: Solve for x
   x = 1,494,818.67/1,561.69
6. Step 6: Final answer
   x = 957.18