Finding the Fourth Proportional to 1,780.52, 2,664.18 and 1,087.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.52 : 2,664.18 = 1,087.76 : x
2. Step 2: Convert to fraction form
   1,780.52/2,664.18 = 1,087.76/x
3. Step 3: Cross multiply
   1,780.52x = 2,664.18 × 1,087.76
4. Step 4: Simplify right side
   1,780.52x = 2,897,975.12
5. Step 5: Solve for x
   x = 2,897,975.12/1,780.52
6. Step 6: Final answer
   x = 1,627.60