Finding the Fourth Proportional to 1,300.99, 1,946.69 and 781.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.99 : 1,946.69 = 781.31 : x
2. Step 2: Convert to fraction form
   1,300.99/1,946.69 = 781.31/x
3. Step 3: Cross multiply
   1,300.99x = 1,946.69 × 781.31
4. Step 4: Simplify right side
   1,300.99x = 1,520,968.36
5. Step 5: Solve for x
   x = 1,520,968.36/1,300.99
6. Step 6: Final answer
   x = 1,169.09