Finding the Fourth Proportional to 1,250.25, 1,875.71 and 428.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.25 : 1,875.71 = 428.59 : x
2. Step 2: Convert to fraction form
   1,250.25/1,875.71 = 428.59/x
3. Step 3: Cross multiply
   1,250.25x = 1,875.71 × 428.59
4. Step 4: Simplify right side
   1,250.25x = 803,910.55
5. Step 5: Solve for x
   x = 803,910.55/1,250.25
6. Step 6: Final answer
   x = 643.00