Finding the Fourth Proportional to 1,488.32, 2,054.70 and 991.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.32 : 2,054.70 = 991.34 : x
2. Step 2: Convert to fraction form
   1,488.32/2,054.70 = 991.34/x
3. Step 3: Cross multiply
   1,488.32x = 2,054.70 × 991.34
4. Step 4: Simplify right side
   1,488.32x = 2,036,906.30
5. Step 5: Solve for x
   x = 2,036,906.30/1,488.32
6. Step 6: Final answer
   x = 1,368.59