Finding the Fourth Proportional to 1,385.91, 2,080.27 and 693.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.91 : 2,080.27 = 693.08 : x
2. Step 2: Convert to fraction form
   1,385.91/2,080.27 = 693.08/x
3. Step 3: Cross multiply
   1,385.91x = 2,080.27 × 693.08
4. Step 4: Simplify right side
   1,385.91x = 1,441,784.00
5. Step 5: Solve for x
   x = 1,441,784.00/1,385.91
6. Step 6: Final answer
   x = 1,040.32