Finding the Fourth Proportional to 1,003.95, 1,504.71 and 612.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.95 : 1,504.71 = 612.72 : x
2. Step 2: Convert to fraction form
   1,003.95/1,504.71 = 612.72/x
3. Step 3: Cross multiply
   1,003.95x = 1,504.71 × 612.72
4. Step 4: Simplify right side
   1,003.95x = 921,965.91
5. Step 5: Solve for x
   x = 921,965.91/1,003.95
6. Step 6: Final answer
   x = 918.34