Finding the Fourth Proportional to 1,615.78, 2,423.10 and 749.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.78 : 2,423.10 = 749.50 : x
2. Step 2: Convert to fraction form
   1,615.78/2,423.10 = 749.50/x
3. Step 3: Cross multiply
   1,615.78x = 2,423.10 × 749.50
4. Step 4: Simplify right side
   1,615.78x = 1,816,113.45
5. Step 5: Solve for x
   x = 1,816,113.45/1,615.78
6. Step 6: Final answer
   x = 1,123.99