Finding the Fourth Proportional to 1,250.01, 1,874.52 and 428.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.01 : 1,874.52 = 428.09 : x
2. Step 2: Convert to fraction form
   1,250.01/1,874.52 = 428.09/x
3. Step 3: Cross multiply
   1,250.01x = 1,874.52 × 428.09
4. Step 4: Simplify right side
   1,250.01x = 802,453.89
5. Step 5: Solve for x
   x = 802,453.89/1,250.01
6. Step 6: Final answer
   x = 641.96