Finding the Fourth Proportional to 1,392.02, 2,086.55 and 697.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.02 : 2,086.55 = 697.58 : x
2. Step 2: Convert to fraction form
   1,392.02/2,086.55 = 697.58/x
3. Step 3: Cross multiply
   1,392.02x = 2,086.55 × 697.58
4. Step 4: Simplify right side
   1,392.02x = 1,455,532.06
5. Step 5: Solve for x
   x = 1,455,532.06/1,392.02
6. Step 6: Final answer
   x = 1,045.63