Finding the Fourth Proportional to 1,003.91, 1,384.50 and 630.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.91 : 1,384.50 = 630.92 : x
2. Step 2: Convert to fraction form
   1,003.91/1,384.50 = 630.92/x
3. Step 3: Cross multiply
   1,003.91x = 1,384.50 × 630.92
4. Step 4: Simplify right side
   1,003.91x = 873,513.61
5. Step 5: Solve for x
   x = 873,513.61/1,003.91
6. Step 6: Final answer
   x = 870.11