Finding the Fourth Proportional to 1,142.04, 1,574.69 and 788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.04 : 1,574.69 = 788.15 : x
2. Step 2: Convert to fraction form
   1,142.04/1,574.69 = 788.15/x
3. Step 3: Cross multiply
   1,142.04x = 1,574.69 × 788.15
4. Step 4: Simplify right side
   1,142.04x = 1,241,080.11
5. Step 5: Solve for x
   x = 1,241,080.11/1,142.04
6. Step 6: Final answer
   x = 1,086.72