Finding the Fourth Proportional to 1,250.37, 1,875.42 and 428.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.37 : 1,875.42 = 428.49 : x
2. Step 2: Convert to fraction form
   1,250.37/1,875.42 = 428.49/x
3. Step 3: Cross multiply
   1,250.37x = 1,875.42 × 428.49
4. Step 4: Simplify right side
   1,250.37x = 803,598.72
5. Step 5: Solve for x
   x = 803,598.72/1,250.37
6. Step 6: Final answer
   x = 642.69