Finding the Fourth Proportional to 1,250.52, 1,875.83 and 428.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.52 : 1,875.83 = 428.87 : x
2. Step 2: Convert to fraction form
   1,250.52/1,875.83 = 428.87/x
3. Step 3: Cross multiply
   1,250.52x = 1,875.83 × 428.87
4. Step 4: Simplify right side
   1,250.52x = 804,475.69
5. Step 5: Solve for x
   x = 804,475.69/1,250.52
6. Step 6: Final answer
   x = 643.31