Finding the Fourth Proportional to 1,401.90, 2,103.45 and 784.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.90 : 2,103.45 = 784.68 : x
2. Step 2: Convert to fraction form
   1,401.90/2,103.45 = 784.68/x
3. Step 3: Cross multiply
   1,401.90x = 2,103.45 × 784.68
4. Step 4: Simplify right side
   1,401.90x = 1,650,535.15
5. Step 5: Solve for x
   x = 1,650,535.15/1,401.90
6. Step 6: Final answer
   x = 1,177.36