Finding the Fourth Proportional to 1,438.77, 1,987.50 and 1,111.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.77 : 1,987.50 = 1,111.32 : x
2. Step 2: Convert to fraction form
   1,438.77/1,987.50 = 1,111.32/x
3. Step 3: Cross multiply
   1,438.77x = 1,987.50 × 1,111.32
4. Step 4: Simplify right side
   1,438.77x = 2,208,748.50
5. Step 5: Solve for x
   x = 2,208,748.50/1,438.77
6. Step 6: Final answer
   x = 1,535.16