Finding the Fourth Proportional to 1,991.32, 2,987.71 and 693.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.32 : 2,987.71 = 693.16 : x
2. Step 2: Convert to fraction form
   1,991.32/2,987.71 = 693.16/x
3. Step 3: Cross multiply
   1,991.32x = 2,987.71 × 693.16
4. Step 4: Simplify right side
   1,991.32x = 2,070,961.06
5. Step 5: Solve for x
   x = 2,070,961.06/1,991.32
6. Step 6: Final answer
   x = 1,039.99