Finding the Fourth Proportional to 1,991.50, 2,988.56 and 1,055.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.50 : 2,988.56 = 1,055.32 : x
2. Step 2: Convert to fraction form
   1,991.50/2,988.56 = 1,055.32/x
3. Step 3: Cross multiply
   1,991.50x = 2,988.56 × 1,055.32
4. Step 4: Simplify right side
   1,991.50x = 3,153,887.14
5. Step 5: Solve for x
   x = 3,153,887.14/1,991.50
6. Step 6: Final answer
   x = 1,583.67