Finding the Fourth Proportional to 1,017.40, 1,401.42 and 784.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.40 : 1,401.42 = 784.12 : x
2. Step 2: Convert to fraction form
   1,017.40/1,401.42 = 784.12/x
3. Step 3: Cross multiply
   1,017.40x = 1,401.42 × 784.12
4. Step 4: Simplify right side
   1,017.40x = 1,098,881.45
5. Step 5: Solve for x
   x = 1,098,881.45/1,017.40
6. Step 6: Final answer
   x = 1,080.09