Finding the Fourth Proportional to 1,003.42, 1,505.62 and 712.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.42 : 1,505.62 = 712.77 : x
2. Step 2: Convert to fraction form
   1,003.42/1,505.62 = 712.77/x
3. Step 3: Cross multiply
   1,003.42x = 1,505.62 × 712.77
4. Step 4: Simplify right side
   1,003.42x = 1,073,156.01
5. Step 5: Solve for x
   x = 1,073,156.01/1,003.42
6. Step 6: Final answer
   x = 1,069.50