Finding the Fourth Proportional to 1,003.01, 1,385.03 and 630.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.01 : 1,385.03 = 630.63 : x
2. Step 2: Convert to fraction form
   1,003.01/1,385.03 = 630.63/x
3. Step 3: Cross multiply
   1,003.01x = 1,385.03 × 630.63
4. Step 4: Simplify right side
   1,003.01x = 873,441.47
5. Step 5: Solve for x
   x = 873,441.47/1,003.01
6. Step 6: Final answer
   x = 870.82