Finding the Fourth Proportional to 1,587.06, 2,188.89 and 1,089.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,587.06 : 2,188.89 = 1,089.99 : x
2. Step 2: Convert to fraction form
   1,587.06/2,188.89 = 1,089.99/x
3. Step 3: Cross multiply
   1,587.06x = 2,188.89 × 1,089.99
4. Step 4: Simplify right side
   1,587.06x = 2,385,868.21
5. Step 5: Solve for x
   x = 2,385,868.21/1,587.06
6. Step 6: Final answer
   x = 1,503.33