Finding the Fourth Proportional to 1,438.69, 1,987.29 and 1,159.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.69 : 1,987.29 = 1,159.99 : x
2. Step 2: Convert to fraction form
   1,438.69/1,987.29 = 1,159.99/x
3. Step 3: Cross multiply
   1,438.69x = 1,987.29 × 1,159.99
4. Step 4: Simplify right side
   1,438.69x = 2,305,236.53
5. Step 5: Solve for x
   x = 2,305,236.53/1,438.69
6. Step 6: Final answer
   x = 1,602.32