Finding the Fourth Proportional to 1,003.79, 1,507.99 and 712.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.79 : 1,507.99 = 712.01 : x
2. Step 2: Convert to fraction form
   1,003.79/1,507.99 = 712.01/x
3. Step 3: Cross multiply
   1,003.79x = 1,507.99 × 712.01
4. Step 4: Simplify right side
   1,003.79x = 1,073,696.63
5. Step 5: Solve for x
   x = 1,073,696.63/1,003.79
6. Step 6: Final answer
   x = 1,069.65