Finding the Fourth Proportional to 1,003.58, 1,384.72 and 630.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.58 : 1,384.72 = 630.64 : x
2. Step 2: Convert to fraction form
   1,003.58/1,384.72 = 630.64/x
3. Step 3: Cross multiply
   1,003.58x = 1,384.72 × 630.64
4. Step 4: Simplify right side
   1,003.58x = 873,259.82
5. Step 5: Solve for x
   x = 873,259.82/1,003.58
6. Step 6: Final answer
   x = 870.14