Finding the Fourth Proportional to 1,242.72, 1,713.12 and 1,030.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.72 : 1,713.12 = 1,030.32 : x
2. Step 2: Convert to fraction form
   1,242.72/1,713.12 = 1,030.32/x
3. Step 3: Cross multiply
   1,242.72x = 1,713.12 × 1,030.32
4. Step 4: Simplify right side
   1,242.72x = 1,765,061.80
5. Step 5: Solve for x
   x = 1,765,061.80/1,242.72
6. Step 6: Final answer
   x = 1,420.32