Finding the Fourth Proportional to 1,037.10, 1,430.52 and 644.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.10 : 1,430.52 = 644.10 : x
2. Step 2: Convert to fraction form
   1,037.10/1,430.52 = 644.10/x
3. Step 3: Cross multiply
   1,037.10x = 1,430.52 × 644.10
4. Step 4: Simplify right side
   1,037.10x = 921,387.56
5. Step 5: Solve for x
   x = 921,387.56/1,037.10
6. Step 6: Final answer
   x = 888.43