Finding the Fourth Proportional to 1,875.78, 2,587.86 and 1,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,875.78 : 2,587.86 = 1,089.72 : x
2. Step 2: Convert to fraction form
   1,875.78/2,587.86 = 1,089.72/x
3. Step 3: Cross multiply
   1,875.78x = 2,587.86 × 1,089.72
4. Step 4: Simplify right side
   1,875.78x = 2,820,042.80
5. Step 5: Solve for x
   x = 2,820,042.80/1,875.78
6. Step 6: Final answer
   x = 1,503.40