Finding the Fourth Proportional to 2,551.56, 3,518.88 and 1,851.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.56 : 3,518.88 = 1,851.72 : x
2. Step 2: Convert to fraction form
   2,551.56/3,518.88 = 1,851.72/x
3. Step 3: Cross multiply
   2,551.56x = 3,518.88 × 1,851.72
4. Step 4: Simplify right side
   2,551.56x = 6,515,980.47
5. Step 5: Solve for x
   x = 6,515,980.47/2,551.56
6. Step 6: Final answer
   x = 2,553.72