Finding the Fourth Proportional to 1,003.51, 1,385.00 and 630.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.51 : 1,385.00 = 630.54 : x
2. Step 2: Convert to fraction form
   1,003.51/1,385.00 = 630.54/x
3. Step 3: Cross multiply
   1,003.51x = 1,385.00 × 630.54
4. Step 4: Simplify right side
   1,003.51x = 873,292.86
5. Step 5: Solve for x
   x = 873,292.86/1,003.51
6. Step 6: Final answer
   x = 870.24